Well, at the risk of stating the obvious, what you maybe are missing is that's precisely why i named this thread 'Convert Nuvi 40/50 (US/EU) to 42/52'. Conversion of many seemingly similar units US to Asian or Asian to US or even [sometimes] Asian to other Asian, unfortunately often results in unsatisfactory results or even downright disaster with an irretrievably bricked unit. Dead as a doornail. Deceased. No more. Never power-up again. A brick as in the true meaning of the word, a solid lump of near-nothingness. A paperweight.

Occasionally it'll all work fine though, maybe with some 'under the hood' firmware manipulation first which is not for the feint-hearted and/or unskilled [include me in latter, not former]. Using the unit's original boot.bin and HWID combined with doing copious NV clears/hard resets and [essential!] an NV backup to restore has always given me a way back though ...

Sorry for the rave-on, but it's best ppl don't attempt cross-flashing US/Asian or Asian/US without understanding the potential risks and the possible usage downsides even if the flash appears successful at first.

The same [Only registered and activated users can see links. ] helps enormously to ensure safety and give more likely satisfactory on-going usability though, just as a difference in the PCB P/Ns pretty much indicates it's useless to try.

Thanks for your report jihen, it is actually appreciated. I think you'll find flashing your TWN 50 to US 50 will result in exactly the same problems as to US 52 btw.