Use a high-quality micro-USB cable for a stable connection.
If your itel A11 is suffering from constant freezing, "Application Has Stopped" errors, or is stuck on the boot logo, performing a firmware update or re-flashing the device is often the best solution. Using the correct can restore your phone to its factory state and fix deep-rooted software glitches. itel a11 flash file upd
Extract the downloaded Flash Tool folder and run the UpgradeDownload.exe or ResearchDownload.exe file. Use a high-quality micro-USB cable for a stable connection