Actually, in order to explore all the functions of my device, I flashed many firmware such as 1300T, 1350T, 1355, 1470T and 1495 with the same boot.bin from v540 (HWID 0972). All of them worked well and I found 1495 had the most functions. The problem appeared after I updated the boot.bin from v540 to v570. Unfortunately, I have not the original firmware just for 1300 since I got the device. What I only have is the gcd file for nuvi 13xx and 14xx series. I guess Garmin fixed gcd v570 to prevent unlock/*****.