Garmin Nuvi 68 to Nuvi 67 SG/MY

Hi All ,

I'm using Nuvi 68 bought in USA but using mostly in Thailand , it's a very good GPS , but the thing is i cannot find Thai Keyboard even update in the Garmin Express to install Thai Keyboard , it will turn out to be all English keyboard anyway .

And I cannot find the KEyboard file to replace in my Garmin .

So I think is it possible if I can convert my Garmin Nuvi 68 , and flash it with Nuvi 67 SG/MY , I think that the hardware is the same , but in APAC Firmware , they should have the Thai Keyboard coming in the firmware so i want to try .

Anyone can guide on this whether it will be a successful flash or not .
Thank you very much .

Best Regards,
George