Hai,kingkai, just wanna to help you, i had trouble updating my gl502vt to since Windows CE update, found the GL502vs thread and this thread, after i read and have courage to try the fix, these are my 3 steps experience before i successfull JUST NOW updated to windows fall CE with the latest update:
1. I have gl502vt with samsung nvme ssd, failed to upgrade to CE since 5-6 months like Saikat, then on dec 2017 i found that gl502vs thread , reading until end of january 2018, i have time and courage to try Disable Smart, and then update again................still failed
2. And then after that, i live with that pesky windows upgrade assistant bla bla bla that want to install upgrade, i uninstall itu from control panel manually . And then 3 days earlier I shutdown and plug off the power supply of my laptop because i went to other town, today when i got back to home and plug in and start the windows again, I leaving the laptop on because some urgent matter, and then after i got back, the perky windows update stucks at 99%, and i googled and found this :
https://support.microsoft.com/en-us/help/4027554/windows-windows-10-upgrade-assistant-is-stuck-at-993.And then i tried to try that FAQ, which with my knowledge this is a way of hard update process with windows disk's file intact , then miracle happen, the update process than cant make through 20%, can make itu through until 30% after the second restart, and then wait and pray, VOILA! the upgrade successful!, and just now again i update with the latest cumulative update that the version build of windows up again after the update.
Truly, i dont know what process that make the windows update successful, but you can look and my experience, sorry if my grammar has many wrong word, i type this with sleepy eyes, i gonna take a sleep after post this, may this experience help you all.