@miroslavbl
Both nuvi 27x9 (HWID 1932) and dezl 770 (HWID 2002) have a shared PCB P/N of 105-02500-00 so it's theoretically possible. Later devices are more resistant to simple conversion however. Try to flash a hybrid firmware of 27x9 boot.bin and remainder of dezl fw components with HWID retained as 1932 to test. Your risk of course however usually retaining HWID means the flash is easily reversible if the device bricks.