If you cannot find a downloadable stock ROM for the LEM9, then you will need to extract and dump the ROM from your watch using WWR-MTK tool and SP FLASH TOOL.
This will give you all the ROM partitions including boot.img and recovery.img for rooting and TWRP respectively.
Basically you switch between the two programs to generate a ROM and scatter text file.
Hovateck has a series of manuals with explanations and screen shots to guide you through the process
I found that you need carefully follow the main manual (and sub manuals) given @ forum.hovatek.com/thread-21970.html
NOTES:
- at Step 17 you need to divert to SP Flash Tool @ forum.hovatek.com/thread-21972.html to do a RAM test
BUT IF YOU ALL YOU SEE IS A DRAM FLIP TEST DO NOT PROCEED but use the following method to make a full ROM dump @https://forum.hovatek.com/thread-22701.html
- at Steps 21 & 22 select preloader.bin instead of ROM_0 as at a previous stage you have changed the ROM_0 from EMMC_BOOT_1 to EMMC_USER and it will not work