Download from Benq Official Site the update you need. If you will not find the variant you need, download any variant (with same SW version) and make the testpoint to phone, than change the variant in your phone (use Joker 0.3.4.3) with the one you have the downloaded update.
After you have changed the variant in phone, proceed to update using the downloaded program.
Tested & working, 100% !
Good Luck!
Best regards, HackTek!