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TESTED FIRMWARE
HANG ON LOGO DONE 
RESTART PROBLEM FIX
FLASH BY UMT QCTOOL
Flashing firmware on the Accent A420 device can be a way to fix software issues such as bugs, errors, or to upgrade the device to a newer version of the operating system.  It requires to download the firmware file and a flashing tool, and also, you should know the correct firmware for your specific device model and also the firmware should be compatible with the device.  The process of flashing firmware can be complex and it is important to follow the instructions carefully. If not done properly, it can cause further issues or even brick the device. If you are not familiar with the process, it is best to seek assistance from the manufacturer or a professional.  Before proceeding with flashing, it is always a good practice to back up all data on the device to prevent any data loss.  It's important to note that flashing firmware on a device may void the warranty of the device.  It is worth noting that Accent A420 is not a known device model, it could be a misspelling or a specific model that is not well-known. It is recommended to check the device manual and check the firmware version of the phone and seek support from the manufacturer if you have any question.