When i flashed mine with openwrt, i used 3.3v serial adapter. I didn’t fry or damage anything. If you’re not sure, use miltimeter to measure voltage before you proceed.
Any specific recommendations on tools to open these up? I am absolutely destroying the plastic with an isesamo(and not sure it's actually undoing the clips)
Some clips on the top, in the middle, will break, so prepare yourself for that. I used a thin, metal spatula or whatever you call it. And you just bend the plastic shell towards you, slowly.
Thanks - When you mentioned spatula, I realized I had some old laboratory spatulas that are really strong. Worked a charm - definitely doesn't seem possible using the isesamo!
I managed to not break any clips, but I've got 5 more to open up, so I doubt I'll be so lucky. Really not a joke how difficult these ones are to open!
Managed to get it going - first time using UART.
I do have a message during boot but I'm unsure if it means anything specific that needs action. It seems to continue on fine in my terminal if I just hit enter when this pops up. The file does exist in openwrt so unsure if this is just a generic u-boot message?
Cannot parse config file '/etc/fw_env.config': No such file or directory
Failed to find NVMEM device
Press the [f] key and hit [enter] to enter failsafe mode
Press the [1], [2], [3] or [4] key and hit [enter] to select the debug level
If it boots fully into OpenWRT, then you can ignore it. So, the uart was 3.3 or 1.8 on yours ?
Good to know - everything seems to have gone well on them
it was 3.3v on all 6 of them (I used a raspberry pi pico h as bridge). Mine are all EU models.