Thread: Modding 3760T

Next step
Then you know what is in your firmware.
Only your original boot.bin will be used for making a modified .gcd or .rgn

Next :: What other region firmware do you like?
Now we have
Sg/My 2.20 / Sg/My 2.30 / Sg/My 2.50
CHN 2.20 / CHN 2.30
Taiwan 2.10

Get the other region gupdate.gcd file you want and extract with RGN_Tool to save
- fw_all.bin
- fw1_resources.bin

The modified .gcd or .rgn file will be
Original US boot.bin + Other region fw_all.bin + other region fw1_resources.bin
but you have to modified hwid of other region (we will say about it later ., This is not all of steps you need to know )

You can simply back data up as you did.
You nuvi won't brick if you use original boot.bin
If you get problem :: it's easy to restore just flash it back with original US gupdate.gcd