Never install software meant for other models (e.g., T8 or T1 Mini Pro) as this can "brick" the device.
Tiger T1 Mini Ultra Software Download _VERIFIED_ - Google Drive. Google Docs Tiger android application Install guide - Tigermeeting Tiger T1 Mini Ultra Software Download- - Google
Prepare the USB Drive: Format a USB flash drive to FAT32. Copy the downloaded software file directly onto the root directory of the drive (not inside a folder). Never install software meant for other models (e