Please refer to the upgrade tutorial: GPS 系列模组升级指南

Download link: gk9501_release_gb_1.4_20180224.zip

Updated: April 28, 2018

Download instructions:

   This firmware is for A9G, only A9G can burn GPS firmware, other modules cannot
   The GPS firmware has been burned by default when leaving the factory, so customers generally do not need to burn this firmware
   GPS firmware is normal and not maintained