Prestigio MultiPad Grace 3157 3G PMT3157 Stock Firmware (Flash File) The Flash File will help you Upgrade, Downgrade, or re-install the Stock Firmware (OS) on your Mobile Device. In addition, the Flash File (ROM) also enables you to repair the Mobile device if facing any Software Issue, Bootloop Issue, IMEI Issue, or Dead Issue. File Name: Prestigio_MultiPad_Grace_3157_3G_PMT3157_v1.0.11_20170831_OTA.zip File Size: 147 MB How to Flash (install): Copy the update.zip file to the phone SD and flash it through the stock recovery mode. Mirror 1 (Free)Mirror 2 (Paid)