A few days ok with A11.0025, then boot looping with oem unlocking disabled

[yvmuell]

Have you done this to get the driver, so not in devce manager?

@yvmuell

If the FP is not recognized in Fastboot:
It can be the cable or USB port, but most of the time it is a fastboot driver problem (on Windows). To update the driver: connect the FP in fastboot mode to the PC, go to Windows Updates, check for updates manually, go to Optional Updates and Drivers and install everything regarding Google/Bootloader (e.g. Kedacom/LeMobile).