Trying to install TWRP on a Lenovo P1a42. I am stuck at step 1 of unlocking the bootloader. 1. I downloaded and installed the ADB & Fastboot installer and the OEM/Google usb drivers. When I try to use the command “adb …..” , it fails and says “adb not recognized as an internal or external command or operable program”. I can see the abd folder with 5 files under my C:\ drive. 2. Cannot locate the correct TWRP file. Any help will be appreciated.