Download latest Android 6.0 stock firmware PC version for Beelink GT1 Ultimate TV Box with AP6225 WiFi Chip from here, here or here. Download latest Android 6.0 stock firmware SD card version for Beelink GT1 Ultimate TV Box with AP6225 WiFi Chip from here, here or here. Download previous firmware from here.
Archive: GT1_313M0_AP6255 / GT1_313M0_AP6255_sdcard
Model: Beelink GT1 Ultimate TV Box with AP6225 WiFi Chip
Image file size: 320 MB / 370 MB
Platform: Amlogic S912
Image name: GT1_313M0_AP6255.img / q201_9377-ota-20170525.zip
Inside archive: firmware + factory_update_param.aml + recovery.img
Build number: Amlogic/q201_9377/q201_9377:6.0.1/MHC19J/20170525:user/test-keys
Caution: Please do not update firmware unless you know what you are doing, you really want it or it is absolutely necessary. Firmware updates may occasionally have bad results, like bricking your device, temporarily or permanently. The firmware update process is done entirely at your own risk. Before attempting to update the firmware, back up your data.