"Quote from: ThornB52 on March 31, 2026, 07:50:39 PMHad a similar problem with the earlier version of this product [FW-7551a-SV1] when trying to boot from the -serial image. Just went unrecognized. The -nano image written to a USB stick did however boot...
I'm entirely new to OPNsense and I'm the same shoes. I recently purchased an FW-7551A-SV1.
- Disabled watchdog timer in BIOS.
- Set console port speed to 115,200 in BIOS.
- Used Rufus 4.14p to write OPNsense 26.1.6 amd64/serial to USB flash drive. I noted in Disk Management that the flash drive partition style was GPT.
- In BIOS, changed boot order to boot first to USB. FW-7551A-SV1 wouldn't boot from flash drive.
- Wrote OPNsense 26.1.6 amd64/nano to flash drive instead and noted that the flash drive partition style is now MBR. FW-7551A-SV1 booted with no problems.
- Logged in as root/opnsense, selected 8 (shell), and entered opnsense-installer at the prompt.
- Completed installation wizard, including selecting to install to internal ~120 GB SSD, set root password, and halted system when finished.
- Changed boot order to boot first from SSD, saved changes and reset. FW-7551A-SV1 won't boot, with error, "Reboot and Select proper Boot device or Insert Boot Media in selected Boot device and press a key."
So, I think I was confused about how nano is intended to work. My understanding now is that it isn't intended to be installed to internal devices such as SSD disks. I would really like to figure out how to get the amd64/serial image installed to the internal SSD. In BIOS, I see:
UEFI 2.3; PI 1.2
American Megatrends
Core Version 5.008
Doing a bit of searching, I think this BIOS version should support GPT partition style / UEFI booting, but I'm seeing nothing related to configure in the BIOS, such as legacy/UEFI/CSM boot, etc.
I have experience with pfSense, and it sounds like others have installed pfSense on the FW-7551A-SV1, but I'm not ready to go that route. I really want to use OPNsense in this instance. I would appreciate your suggestions/input!
