On this page, you will find the official link to download Lenovo P1 Stock Firmware ROM (flash file) on your Computer. Firmware comes in a zip package, which contains Flash File, Flash Tool, Driver and How-to Manual.
Download Lenovo P1 Stock Firmware (flash file)
File Name: Lenovo_P1a42_USR_S137_151028_ROW_SD.zip
File Size: 1 GB