[Solved] Sophos AP55: No 5G wifi after upgrade

[elder_tinkerer]

Hello,
while tidying up my shelves and cabinets i found a nearly forgotten Sophos AP55.
A quick check revealed that it was still running OpenWrt 22.03. So i decided to upgrade it to 25.12.1.
But after the upgrade the 5G wifi was vanished. In the Status overview there was only the 2.4G radio.
O.K, i thought and reflashed the device with the old image. Unfortunately radio 1 is still missing.
After connecting the serial and a restart i found the following warning from the U-Boot:

U-Boot 1.1.4-gb47de1b6 (Jan 24 2017 - 11:22:47)
ELX version: 1.0.0

7679WSC - Scorpion 1.0DRAM:
sri
Scorpion 1.0
ath_ddr_initial_config(178): (32bit) ddr2 init
tap = 0x00000003
Tap (low, high) = (0x6, 0x1d)
Tap values = (0x11, 0x11, 0x11, 0x11)
128 MB
Flash Manuf Id 0xc2, DeviceId0 0x20, DeviceId1 0x18
Flash [MX25L12845E] sectors: 256
Flash: 16 MB
*** Warning *** : PCIe WLAN Module not found !!!
In:    serial
Out:   serial
Err:   serial
Net:   ath_gmac_enet_initialize...
athrs_sgmii_res_cal: cal value = 0xe
ath_gmac_enet_initialize: reset mask:c02200
Scorpion ---->8035 PHY*
AR8035 PHY reg init
: cfg1 0x80000000 cfg2 0x7114
eth0: 00:1a:8c:ca:44:58
AR8035 found!
[0:4]Phy ID 4d:d072
Port 0, Neg Success
eth0 up
eth0
Setting 0x18116290 to 0x458ba14f
Hit any key to stop autoboot:  0
ath>

So i assume, the missing 5G wifi module is the mentioned PCIe WLAN module that’s not been found.
My question is: Might this be still a configuration error or died some hardware just at the same time while i did the upgrade (thank you, Murphy)?

[frollic]

U-Boot starts before OpenWRT, you can't misconfigure OpenWRT to make U-Boot not find the module.

[elder_tinkerer]

I thought so too, but it doesn't hurt to ask if one isn't sure.

So this seems to be another piece for the recycling bin - a 2.4G only AP isn't really useful for me.

[frollic]

Would be great for IoT though.

[elder_tinkerer]

I dismantled and dumped it.