# Eprom? boot priority?
**URL:** https://dietpi.com/forum/t/eprom-boot-priority/25380
**Category:** Troubleshooting
**Created:** [6 August 2026 12:32 UTC](https://dietpi.com/forum/t/eprom-boot-priority/25380 "2026-08-06T12:32:43Z")
**Posts on this page:** 20
**Page:** 1
### Author:  [@kannz](https://dietpi.com/forum/u/kannz)
#### Post date: [6 August 2026 12:32 UTC](https://dietpi.com/forum/t/eprom-boot-priority/25380/1 "2026-08-06T12:32:43Z")
hiya I was recently given a pi 5. i tried to boot from a nvme and it seems i need to update my eeprom. It doesn’t seem like its working.. I’m getting a error saying WARNING: flashrom not found. Setting RPI\_EEPROM\_IMMEDIATE\_UPDATE to 0.
im not sure what that means. I was trying to boot from nvme with this board [Amazon.com: PCIe to 4-CH M.2 M Key Adapter Board Compatible with Raspberry Pi 5, Support 4-CH NVMe Solid State Drives-2280/2260/2242/2230, Allow Powering Pi 5, Onboard LED Indicators, High-Speed Reading/Writing : Electronics](https://www.amazon.com/dp/B0F18TFMS2?ref=ppx_yo2ov_dt_b_fed_asin_title) when instead of booting it went looking for a sdcard and wouldn’t boot. then I tried to update the eeprom and it doesnt seem like it updated it otherwise i think this error would be gone after a reboot right? do i need to install raspberry pi os to update this?
### Creating a bug report/issue
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- DietPi version | G\_DIETPI\_VERSION\_CORE=10
G\_DIETPI\_VERSION\_SUB=5
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- Distro version | trixie 0
- Kernel version | Linux DietPi 6.18.39+rpt-rpi-2712 #1 SMP PREEMPT Debian 1:6.18.39-1+rpt1 (2026-07-29) aarch64 GNU/Linux
- Architecture | arm64
- SBC model | RPi 5 Model B (aarch64) or (EG: RPi3)
- Power supply used | (5v5amp)
- SD card used | (lexar)
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---
### Author:  [@MichaIng](https://dietpi.com/forum/u/MichaIng)
#### Post date: [6 August 2026 13:12 UTC](https://dietpi.com/forum/t/eprom-boot-priority/25380/2 "2026-08-06T13:12:18Z")
To update the EEPROM bootloader directly, you need to install `flashrom`. Otherwise, it is updated on next reboot by the bootloader itself.
If you want to mute the warning permanently, either `sudo apt install flashrom`, or `sudo rpi-eeprom-config -e`, and add `RPI_EEPROM_IMMEDIATE_UPDATE=0` to disabled immediate updates explicitly.
Note that generally, you do not need to care about EEPROM updates at all. A boot service checks for and applies updates automatically on every boot. All you need to do it keeping the `rpi-eeprom` package up-to-date along with other APT packages via `apt upgrade`. These apply “default” builds, while there are “latest” builds which can optionally be flashed. But as long as the vendor of this M.2 HAT or SSD does not say so, you shouldn’t touch the default branch.
If boot from that NVMe keeps failing, have a look at the bootloader output: Does it detect the SSD at all, or does it fail to detect a bootable partition on it, or other kind of probe or I/O error? You should generally see the output on HDMI, but easier to copy&paste is it when using a UART adapter, so see all output on the serial console.
Does the SSD show up, and can be mounted/accessed, when you boot from SD card?
Also, do you use the official RPi PSU, or some other/noname 5V5A adapter? Insufficient voltage is a common issue, and 3rd party adapter can have issues providing stable voltage when power draw fluctuates.
---
### Author:  [@Joulinar](https://dietpi.com/forum/u/Joulinar)
#### Post date: [6 August 2026 14:24 UTC](https://dietpi.com/forum/t/eprom-boot-priority/25380/3 "2026-08-06T14:24:58Z")
sometimes the boot order needs to be adjusted to be able to boot from nvme [https://www.raspberrypi.com/documentation/computers/raspberry-pi.html#raspberry-pi-bootloader-configuration](https://www.raspberrypi.com/documentation/computers/raspberry-pi.html#raspberry-pi-bootloader-configuration)
---
### Author:  [@kannz](https://dietpi.com/forum/u/kannz)
#### Post date: [6 August 2026 23:24 UTC](https://dietpi.com/forum/t/eprom-boot-priority/25380/4 "2026-08-06T23:24:12Z")
I only cared about eeprom because the raspberry said it wasn’t booting and it says in config it needs a update. how do i install flashrom?
welp I swapped the ssd hat i was using and it is detected..i still kind of need to know how to update eeprom though..also i connected a fan and it doesn’t seem to turn on the fan..
EDIT: oh also no the ssd wasnt detected at all using that 4in1. the only error that was showing was the need for a update to the eeprom/usbvlsomething
editedit: also I’m using a rastech powersupply it seems good. oh hmm you said it needs 5v.5a? hmm i think mine is 5.1v.. i may need a different psu. but i also have the psu that came with the hat that didn’t work. its..12v4a. did that send me the wrong cable? so i need a 5v5amps..
---
### Author:  [@MichaIng](https://dietpi.com/forum/u/MichaIng)
#### Post date: [7 August 2026 00:04 UTC](https://dietpi.com/forum/t/eprom-boot-priority/25380/5 "2026-08-07T00:04:52Z")
5.1V is fine. The 12V4A PSU was for powering the HAT, and then powering the RPi 5 via HAT, rather then the other way round. That should work as well.
> [@kannz](#):
>
> the only error that was showing was the need for a update to the eeprom/usbvlsomething
Where do you see this? The USB VL805 host controller EEPROM is not even used anymore, and I don’t think it was ever implemented on the RPi 5 at all 🤔. Here it is: [https://www.raspberrypi.com/documentation/computers/raspberry-pi.html#bootloader-update-files](https://www.raspberrypi.com/documentation/computers/raspberry-pi.html#bootloader-update-files)
So the VL805 USB controller was only ever used on Raspberry Pi 4B v1.3 and earlier.
What does `rpi-eeprom-update` return? It should not show anything about the `VL805` on the RPi 5, and does not do so in my case. But maybe that message was just a generic one, which did not mean the VLI firmware in particular, but just an EEPROM update in general, which can include bootloader as well as VLI USB firmware, if that has an EEPROM as well. In any case, `rpi-eeprom-update` should tell you whether a bootloader firmware is available. If so, `rpi-eeprom-update -a` can be used to apply it.
I just see, the `rpi-eeprom.service` adds the `-s` flag as well, which skips the update, as long as the current version is not below `BOOTLOADER_AUTO_UPDATE_MIN_VERSION`, which currently defaults to `1746713597`: [rpi-eeprom/rpi-eeprom-update at 8f9ecc498a09aed0c39c085f87519a9075edd70e · raspberrypi/rpi-eeprom · GitHub](https://github.com/raspberrypi/rpi-eeprom/blob/8f9ecc498a09aed0c39c085f87519a9075edd70e/rpi-eeprom-update#L556)
This was the reason that I needed to run `rpi-eeprom-update -a` manually once, to apply version `1779807685`. Now, a reboot later, there is no update available anymore. No `flashrom` needed.
---
### Author:  [@kannz](https://dietpi.com/forum/u/kannz)
#### Post date: [7 August 2026 00:25 UTC](https://dietpi.com/forum/t/eprom-boot-priority/25380/6 "2026-08-07T00:25:51Z")
this is different than what it was showing me before.
BOOTLOADER: up to date
CURRENT: Tue May 26 15:01:25 UTC 2026 (1779807685)
LATEST: Tue May 26 15:01:25 UTC 2026 (1779807685)
RELEASE: default (/usr/lib/firmware/raspberrypi/bootloader-2712/default)
Use raspi-config to change the release.
root@dietpipii:~#
---
### Author:  [@kannz](https://dietpi.com/forum/u/kannz)
#### Post date: [7 August 2026 01:00 UTC](https://dietpi.com/forum/t/eprom-boot-priority/25380/7 "2026-08-07T01:00:47Z")
uhm could you recommend a powersupply? every powersupply on amazon is 5.1 not 5.5 and 4amps not 5. 😕 even a few power supplies that are official are 5.1. [Official Raspberry Pi 45W USB-C Power Supply : Adafruit Industries, Unique & fun DIY electronics and kits](https://www.adafruit.com/product/6320#description) (this one shows 5.1v and 5amps)
---
### Author:  [@Joulinar](https://dietpi.com/forum/u/Joulinar)
#### Post date: [7 August 2026 07:31 UTC](https://dietpi.com/forum/t/eprom-boot-priority/25380/8 "2026-08-07T07:31:46Z")
did you already checked `rpi-eeprom-config`?
```auto
root@DietPi5:~# rpi-eeprom-config
[all]
BOOT_UART=1
POWER_OFF_ON_HALT=0
BOOT_ORDER=0xf416
root@DietPi5:~#
```
My RPi5 is booting fine from nvme
```auto
root@DietPi5:~# lsblk -o name,fstype,label,size,ro,type,mountpoint,partuuid,uuid
NAME FSTYPE LABEL SIZE RO TYPE MOUNTPOINT PARTUUID UUID
nvme0n1 119.2G 0 disk
├─nvme0n1p1 vfat 128M 0 part /boot/firmware 84ed3ab4-01 DE54-FC66
└─nvme0n1p2 ext4 119.1G 0 part / 84ed3ab4-02 e7098b79-fc5f-455a-a84a-234fa3e7d6f6
root@DietPi5:~#
```
---
### Author:  [@Jappe](https://dietpi.com/forum/u/Jappe)
#### Post date: [7 August 2026 08:54 UTC](https://dietpi.com/forum/t/eprom-boot-priority/25380/9 "2026-08-07T08:54:46Z")
> [@kannz](#):
>
> uhm could you recommend a powersupply? every powersupply on amazon is 5.1 not 5.5 and 4amps not 5.
5.1V and 5.0V is fine, here is one with 5A
[https://www.amazon.de/Geekworm-USB-C-Netzteil-5-1V-Raspberry-Black/dp/B0FGPSRQ75](https://www.amazon.de/Geekworm-USB-C-Netzteil-5-1V-Raspberry-Black/dp/B0FGPSRQ75)
---
### Author:  [@MichaIng](https://dietpi.com/forum/u/MichaIng)
#### Post date: [7 August 2026 13:58 UTC](https://dietpi.com/forum/t/eprom-boot-priority/25380/10 "2026-08-07T13:58:26Z")
So your EEPROM bootloader is now up-to-date, and as expected, the VLI USB EEPROM does not exist. Problematic, if it still appears in some output somewhere. Even on the old RPi 4 revisions, which do have that EEPROM, it is not used anymore. Reminds me to remove it from `dietpi-config` as well. Though, I am better making sure about this: [https://forums.raspberrypi.com/viewtopic.php?t=400026](https://forums.raspberrypi.com/viewtopic.php?t=400026)
EDIT: Okay, the older RPi 4 models, resp. the VL805 chip itself, still load the firmware from the dedicated EEPROM, if present. So it is still relevant for USB boot there. But as there was no update for 3 years, unlikely to be any, there is less reason to show its version in `dietpi-config` advanced options, showing “N/A” on most RPi 4/5 boards.
Whether PSUs show 5.0V or 5.1V or just 5V is just marketing. Showing 5.1V aims to give the impression that it would be able to keep the 5V USB specifications even with bad cables and fluctuations. But whether it theoretically gives 5.0V or 5.1V or 4.9V peak or whatever does not say much. It is much more important that it can keep the desired voltage within narrow ranges, even when input and power draw fluctuate. Even a 4.8V PSU with bad cable would run an SBC stable, if there are no negative spikes. Since this quality cannot be seen from the specs, and Amazon ratings are not 100% reliable, a safe bank is to use the official RPi 5 PSU.
The other aspect are the 5A. I don’t know how much the power the M.2 board and SSD draw. But if you power the M.2 board from the RPi 5 (hence with 5V), like on the left picture (below), less than 5A seems too tight. Doing it the other way round, powering the RPi 5 from the M.2 board, via its 12V4A PSU, gives a lot more power:
- Power via RPi 5: `5V * 5A = 25W`
- Power via M.2 board: `12V * 4A = 48W`
So to rule out a powering issue, I’d go with the 2nd option as in the right picture.
---
### Author:  [@kannz](https://dietpi.com/forum/u/kannz)
#### Post date: [8 August 2026 00:58 UTC](https://dietpi.com/forum/t/eprom-boot-priority/25380/11 "2026-08-08T00:58:14Z")
k I’ll try out the barrel powersupply with that weird board later when I have the time. also at the moment my pi is working normally and booting nvme from a hat. just that board wont boot. the one with the anime character on it. thanks for the info 🙂
EDIT: this is the output of “rpi-eeprom-config”
[all]
BOOT\_UART=1
BOOT\_ORDER=0xf461
NET\_INSTALL\_AT\_POWER\_ON=1
---
### Author:  [@Joulinar](https://dietpi.com/forum/u/Joulinar)
#### Post date: [8 August 2026 08:21 UTC](https://dietpi.com/forum/t/eprom-boot-priority/25380/12 "2026-08-08T08:21:09Z")
> [@kannz](#):
>
> BOOT\_ORDER=0xf461
ok its trying to boot from SD card first, followed by nvme and usb mass storage. At least this should be ok if no SD card is present
---
### Author:  [@kannz](https://dietpi.com/forum/u/kannz)
#### Post date: [9 August 2026 07:13 UTC](https://dietpi.com/forum/t/eprom-boot-priority/25380/13 "2026-08-09T07:13:34Z")
I’m guessing the small cable was defective making the nvme not show up or the nvme board itself or even my lower amp powersupply. I’m receiving a new cable and a better usbc powersupply. I’ll also try the barrel powesupply sometime tomorrow. thank you for the info about how its booting. 🙂
---
### Author:  [@herman45](https://dietpi.com/forum/u/herman45)
#### Post date: [9 August 2026 14:15 UTC](https://dietpi.com/forum/t/eprom-boot-priority/25380/14 "2026-08-09T14:15:01Z")
The flashrom not found message doesnt necessarily mean the EEPROM update itself failed. It means DietPi couldnt use flashrom for the immediate update. For a Pi 5, first boot normally from the SD card, make sure the system packages are up to date, then update the EEPROM from Raspberry Pi OS or the supported rpi-eeprom-update tools. After [`reboot`](https://speedport-ips.de/), check the EEPROM version and boot order with rpi-eeprom-update / rpi-eeprom-config. Also make sure your NVMe adapter is actually compatible with the Pi 5 PCIe interface. Once the EEPROM is current, you can set NVMe/PCIe before SD in the boot order. 😗
---
### Author:  [@MichaIng](https://dietpi.com/forum/u/MichaIng)
#### Post date: [9 August 2026 14:18 UTC](https://dietpi.com/forum/t/eprom-boot-priority/25380/15 "2026-08-09T14:18:07Z")
> [@herman45](#):
>
> then update the EEPROM from Raspberry Pi OS
Or from DietPi, which ships exactly the same tools from the same repo. But we ruled out the bootloader version to be the culprit already. Essentially, this is generally something one needs to almost never care about, all critical updates are done automatically, on DietPi same as on RPi OS.
> [@kannz](#):
>
> I’m guessing the small cable was defective making the nvme not show up or the nvme board itself or even my lower amp powersupply.
That would indeed explain both symptoms very well: that the SSD is not detected, as well as that the 12V4A PSU to power the RPi 5 through the extension board does not work. Let’s hope the replacement cable solves this.
---
### Author:  [@kannz](https://dietpi.com/forum/u/kannz)
#### Post date: [9 August 2026 23:15 UTC](https://dietpi.com/forum/t/eprom-boot-priority/25380/16 "2026-08-09T23:15:48Z")
Tried the barrel PSU and it didn’t work so I’ll try a different small pcie cable and see if that’s the reason. If not I will then try a different barrel PSU with more amps and a different USBC cable with more amps (5 amps instead of 4).
If none of that works I’ll just have to send the board back as these boards can easily be defective.
I mostly wanted the 4 nvme/m.2 slots to have 2 separate ssds apart from the 1st main ssd that contains dietpi install and maybe one of those sata adapters to use one or two sata ssd drives.
---
### Author:  [@MichaIng](https://dietpi.com/forum/u/MichaIng)
#### Post date: [9 August 2026 23:44 UTC](https://dietpi.com/forum/t/eprom-boot-priority/25380/17 "2026-08-09T23:44:26Z")
So you did exchange the 3-pins cable which connects extension board power with RPi pins 2+4+6? That cable being damaged or falsely attached would explain things best.
---
### Author:  [@Joulinar](https://dietpi.com/forum/u/Joulinar)
#### Post date: [10 August 2026 10:47 UTC](https://dietpi.com/forum/t/eprom-boot-priority/25380/18 "2026-08-10T10:47:26Z")
I have seen an Amazon review from someone who complained about the board not able to boot.
---
### Author:  [@kannz](https://dietpi.com/forum/u/kannz)
#### Post date: [10 August 2026 14:33 UTC](https://dietpi.com/forum/t/eprom-boot-priority/25380/19 "2026-08-10T14:33:52Z")
yeah I saw multiple people say that. it could be because of lots of bad power supplies or this company is bad at sourcing parts or even their fabrication of parts is bad or the shipper damages parts. last one would be stupid customers but i doubt that one.. I haven’t received my replacement pcie cable yet it will get to me about 2 to 4 days. I’ll know the part is bad when i test the board with this replacement part. at the moment i think its the pcie cable because it has a weird defect in it.
EDIT: 3 pins cable? you mean this one? i don’t have another one of those. maybe i will look for another one of those before tossing the board back at amazon.
---
### Author:  [@MichaIng](https://dietpi.com/forum/u/MichaIng)
#### Post date: [10 August 2026 14:53 UTC](https://dietpi.com/forum/t/eprom-boot-priority/25380/20 "2026-08-10T14:53:21Z")
> [@kannz](#):
>
> EDIT: 3 pins cable? you mean this one? i don’t have another one of those. maybe i will look for another one of those before tossing the board back at amazon.
Right, that one. The 12V4A PSU should be more than powerful enough. Even if the PCIe cable was damaged, it should boot the RPi 5. If it does not do that at all, possible that due to damage or connectivity of this 3-pins cable, power is just not transferred between board and RPi 5 (in both directions, depending on which PSU you use).
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