FLsun t1 pro
MCU / Printerboard: Pi
Host / SBC mansail klipper
klippy.log
After an unsuccessful update of the brains on which there was no printer serial number, files disappeared and there is no connection to the server, what is it and what files have disappeared and where to look for them again??
Is your touchscreen useable? If so try to do an OTA firmware reset.
The upgrade package you linked only has new/updated files and brute-force overwrites over the existing installation. It is likely you can never get back to where you started.