I messed up while sysupgrading an EAP615-Wall, bumping into the cable from the PoE switch (which did not seem to be fully plugged in, I know... ). It looks like the upgrade botched, and OpenWrt isn't booting anymore.
A good Samaritan soldered me a serial header, so I could hook it up and TFTP an image to the bootloader, then sysupgrade. So far, so good. The AP didn't come alive at the first try, but I thought it might be my PoE switch. However, while the TFTP boot and subsequent sysupgrade went fine, when rebooting the device didn't come up. The switch doesn't seem to get a request to deliver power, and it takes quite a few tries before it does and the AP shows signs of life...
Despite being able to TFTP boot first, I am now only seeing this:
U-Boot SPL 2018.09 (Feb 20 2021 - 09:43:17 +0800) Trying to boot from NOR Error: LZMA uncompression error: 1 Trying to boot from UART Failed to load U-Boot image! Entering emergency mode. Please transmit a valid U-Boot image through this serial console. The U-Boot image will be booted up directly, and not be written to flash. Accepted mode is Ymoden-1K.
I didn't see this the first time the device came up, which suggests the bootloader got corrupted after somehow? Is that possible? Darn tiny window if so .
I haven't tried to feed it a U-Boot image yet. I'd like to know if this suggests a hardware failure though? If I get this device going again it will be deployed remotely, I cannot just get to it to replace it...
Thankful for any insights.