: It is critical to use firmware matching your device's specific region to avoid permanent software damage. How to Update or Flash Firmware
Huawei removed most S7 firmware in 2018. However, the (third-party mirror of historical updates) still holds some files. Search for “Huawei S7-721u firmware download” on: huawei s7-721u firmware
Released 2014, March 350g, 9.9mm thickness Android 4.3, EMUI 1.6 4GB/8GB storage, microSDHC. GSMArena.com S7-721U | MediaPad 7 Youth 2 [Stock Firmware] - MobileBaz : It is critical to use firmware matching
Ensure the battery is at least 60% charged. Interrupting this process can permanently brick the device. 9.9mm thickness Android 4.3