Do you remember if you could get to a rommon prompt? As long as console access is available you should've been able to upload replacement FW. I once had to use kermit or xmodem (I don't recall) @2400 bps to recover an AP by transferring new FW over the console cable (I'm not sure new APs even have a console port), but switches should be recoverable...the things you do, when you want to go home and not spend another day on site 🤣

My only caution would be to ensure that you use the correct FW. IIRC -L means Lan Base not IP Services, but it should warn you that there isn't enough space, if that's the case