Press and hold the keys (or sometimes 1 + 2 ) while connecting the USB cable to the computer.
: Power off the phone, hold the "1" and "2" keys simultaneously, and connect it to a PC via Micro USB to initiate the transfer. C3520 Flash Loader 7.5.4.20csc 20v0.2 Citrus Lite Zip c3520 flash loader 75 4 csc v02 citrus 218l better
A flash loader, also known as a bootloader, is a small program that loads the operating system and other software into a device's memory. It's usually stored in a non-volatile memory location, such as a flash memory chip. Press and hold the keys (or sometimes 1