Welcome to the club!! I struggled quite a bit when changing my SSD and HDD on my GL702VM.
The trick is to update BIOS with the new SSD connected. Then install OS all over again. If you already have updated your BIOS to the last version like me, then you have to downgrade it and upgrade it again to the last version (all with the new SSD on).
There are a few tricks on how to downgrade it, the DATE trick seems to be the best one - (https://rog.asus.com/forum/showthread.php?111217-GL702VM-not-booting-after-windows-update-updated-th...) all explained here.
Currently i have BIOS version 304, altough the dates does not match with the dates that are mentioned here https://www.asus.com/supportonly/GL502VM/HelpDesk_BIOS/
Is it safe to downgrade to previous version, as it shows on asus driver page that the previous version for my model is 202, not 303 or something or the version number doesnt matter?
Thanks everyone. Unfortunately i did not succeed. Still the same behavior.
What i did was,
remove my HDD, put in the SSD
downgraded to bios version 300, using this guide https://rog.asus.com/forum/showthread.php?11438-How-to-downgrade-your-Bios-using-Winflash
confirmed it was 300.
updated back to 304.
reinstalled windows, when installing, at the end it does a restart and i get the same error.
completed the install, tried to restart with no success.
Any other suggestions, or maybe i did something wrong?
One important question does your laptop come with both SSD and HDD originally and you are replacing the HDD and keep both 2 SSD's?
You have to try one thing first. Downgrade again to 300 and install the OS. Check if it works fine on 300. If that´s the case then no need to reinstall again the OS and only try again to upgrade to 304.
If it still does not work, then using BIOS 300 , go to BIOS options and disable secure boot. Reinstall OS again with this option turned off, upgrade to 304 once more. If in the end is working, go again to BIOS and activate again the Secure Boot. Hope this times it helps.
It came only with HDD, and i wanted to add an SSD and keep the HDD also.
So i did what you suggested, but still no luck.
Should i be downgrading from my HDD ?
i took out the hdd
downgraded to 300,
reinstalled. (during installation it requires restart and i get the error)
right after ROG logo i get the error and it gives me the option to press esc to get into bios, after i exit the bios it boots up, completes the windows installation.
tried to restart, same error.
updated to 304, still the same.
Then i tried disabling secure boot with 300 and reinstalling, but instead of the error i get just a blank blue screen that flickers to black if i press enter, but gets back into bios if i press esc. This is the error screen.