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TESTED FIRMWARE HANG ON LOGO DONE
THERE ARE TOO MANY FILE 
CHECK YOUR REGON 
AND FLASH OWN FIRMWARE
OnePlus_7_14_H.10_190523.zip
OnePlus_7_14_E.25_200327
OnePlus_7_Europe_14_E.31_211021
OnePlus_7_Chinese_14_H2E01
OnePlus_7_Global_14
OnePlus_7_India_Global_14_P.01
OnePlus_7_India_And_Global_14_P.01
OnePlus_7_14_P.26_200322
Oneplus_7_14_P.32_210127
The OnePlus 7 flashing can refer to the phone's screen flashing or the device rebooting repeatedly. The cause of this issue can be related to software or hardware issues. Some possible solutions for this issue include:  Restarting the device: Hold down the power button for a few seconds until the phone turns off, then turn it back on.  Clearing the cache partition: This can be done by turning off the device, then press and hold the volume down and power button until the OnePlus logo appears. Release the buttons and use the volume buttons to navigate to "Wipe cache partition" and select it using the power button.  Safe mode: This will help identify if the issue is caused by a third-party app. To enter Safe mode, turn off the phone, turn it on and when the OnePlus logo appears press and hold the volume down button until the lock screen appears.  Factory reset: This will erase all data and settings on your phone, so make sure to back up important files before proceeding.  If none of the above solutions work, it may be necessary to take the phone to a professional for further diagnosis.  It is also advisable to contact OnePlus support for further assistance and guidance.