you need sp flash tools from here: https://spflashtools.com/
then you need a scatter file, I can’t find the stock firmware for the lem 11 now but you can take the scatter from the lem t firmware(the scatter files is basically the same for all the mt6739 watches): LEM T Reviews and FAQs
flash in download only mode, then you can root it with magisk: https://magisk.me/zip/
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