Flashing a S2+

I have opened a S2+ in order to flash a new FW but surprisingly it has a non soic, non Attiny MCU.
Has anyone manged to flash it? and if so with what FW.

That’s the driver used in the SST-40 version. No firmware available for download. Not sure if it is even possible to flash this MCU or if it can be written only once.

So is the only way is to replace the driver or anybody has a better solution?

Replace the driver as far as I know

Disappointing because it’s a great driver, but I’d like to update it to behave more like babka. Unfortunately the programmer for those MCUs is hard to find, and only supports a commercial compiler.