Hi, sorry just saw this message.
I posted in the TWRP Recovery Lem X section about what I did to fix it. I’ll copy and paste it here:
“Everything working really well now. I ended up flashing it back to factory reset to start all over, but I think the problem was after I install the patcher.zip, I install the twrp_image file and every time I did that, it did something to the partition and the OS, it removed the OS somehow. I skipped that part and just installed Magisk after I installed the patcher.zip. Now everything working very smooth.”
So if you got stuck like I did, first flash Lemx back to original state. There is a zip file here: 20180830 download = drive.google.com/file/d/1GbKrtEBSZYvxVIjQsDv3oWHl8n-8fM-u/view?usp=sharing
Once you download that, unzip it.
Step 1) Go into flash_tool, change Scatter-loading file to: MT6739_Android_scatter from the unzip 20180830 file located under the image folder.
Step 2) Just like before, click Download button and let the watch run the download to wipe fresh and install back to factory reset. (THIS WILL INSTALL WATCH BACK TO NORMAL, like brand-new after you finish this step).
Step 3) [from /thread/2740/twrp-lemx ] - Provided by iscle and RASC Moderators. IMPORTANT TO IGNORE the other steps from the top basically the steps about "If you have TWRP installed already"*
BUT START HERE!:
If you don’t have TWRP installed:
With your watch turned on, copy the file “TWRP_patcher.zip” to the /sdcard directory.
Turn off your watch.
Open sp flash tool
In the “Scatter-loading File” box choose the “MT6739M_Android_scatter.txt” file in the TWRP_image folder
Press on “Download”.
Connect the watch dock/cable to the computer.
Put the watch on your dock/cable and wait until a green tick appears on the screen.
Unplug your watch from the computer and power it on. It will automatically boot to TWRP.
WARNING: the following step (9) will install the default boot.img for the stock rom of the device. If you have another rom installed, be sure to flash it after finishing this guide.
On the recovery, go to Install -> Install Zip and select the previously copied file “TWRP_patcher.zip”
Wait until it finishes and that’s it!
Download TWRP for LEMX here drive.google.com/file/d/1F0uvm_7G_-rnRrHZcWAcKKqdmGZv3aW7/view?usp=sharing
ADB utility here drive.google.com/file/d/1Uz75C_KHBKkmssF_FRNlrS03B0vh9uON/view?usp=sharing
Step 4: Immediately install Magisk right away.
Step 5: reboot phone and it should work normally and be rooted with Magisk.
I hope that helps! It worked for me after few hours of testing lol.