Hi Brestinder,
To tell which firmware version you have, have for instance a look at http://wiki.openezx.org/Original_firmware_versions.
You can find unbranded firmware in the Downloads section of this forum. How to flash it can be found in the (long) Latest Firmware: R52_G_0D.76.A1R_0D.C0.B1P thread in this forum.
Note that is very unlikely that you will be able to enable GPS by reflashing the unit...



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