Based on the reverse engineering efforts outlines in the last logs, I developed a python utility similar to esptool - which I hence named rtltool.

The functionality is very rudimentary. It provides commands for reading, erasing, writing and verifying contents of the micro controllers flash via UART.

To obtain a complete flash dump of the FT10 smart watch, run

./rtltool.py read_flash 0x00800000 0x00800000 ft10-flash_dump.bin

 This can then be verified with

./rtltool.py verify_flash 0x00800000 ft10-flash_dump.bin