Download latest Android 6.0 stock firmware for Beelink GT1 9377 TV Box from here, here or here. Download latest Android 6.0 stock firmware for Beelink GT1 6255 TV Box from here, here or here. Download Amlogic USB Burning Tool v188.8.131.52 from here. Here you can read about the unboxing Beelink GT1 TV Box.
Archive: GT1 9377 / GT1 6255
Model: Beelink GT1 TV Box
Image file size: 1.09 GB / 1.08 GB
Platform: Amlogic S912
Image name: GT1_106M0.img – q201_9377-ota-20161024.zip / GT1_106M0_AP6255.img – q201_9377-ota-20161024.zip
Inside archive: firmware + factory_update_param.aml + recovery.img
Build number: Amlogic/q201_9377/q201_9377:6.0.1/MHC19J/20161024: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.