Devices with Qualcomm or Spreadtrum chipset
Dangerous
(continued from Permanently root a device by patching the boot partition)
Before you start, make sure you have a debug-enabled device with debugging mode activated, and a computer with ADB ready.
Get a copy of the stock boot partition
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Download and install OmniBB and either Wallace Toolbox or ADBroot on your phone, using one of the guides from Debugging on actual devices. OmniBB injects the Busybox binary into the system, so that Wallace Toolbox and ADBroot can gain deeper system control and provide elevated ADB shell access.
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Open OmniBB