This firmware is for GPD XD Plus Tablet GamePad with Mediatek MT8176 as CPU. You can now buy GPD XD Plus Tablet GamePad from for a very good price.
Download Android Nougat 7.0 stock firmware for GPD XD Plus Tablet GamePad from here or here.
Firmware details
Archive name: XDS_en_vr_1.13-ota-1553054487
Image: update.zip
Archive file size: 1.28 GB
Platform: Mediatek MT8176
Build number: GPD/GPD/gpd_en_vr:7.0/NRD90M/1553054487: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.