Hello,
same issue here, after failed online update, green LED keeps fast flashing. Only Bootloader is flashable via ST-Link.
But no connection via python driver. With all options / baud rates etc.
RTK GNSS INS App does not flash because of Memory bigger than flash memory...
The demo App loads via ST-link but still no connection via USB python.

Can you help me out?
Device: OpenRTK330L OpenRTK330LI 5020-3021-01 SN:2075000361
Thanks