On this page you will find RULEX RM21 stock flash file firmware 100% tested free for google download link. This stock flash file (firmware) comes with zip compress. Use win rar for unzip. This file contain Flash File, Usb Driver, Flash Tool And how to flash.
RULEX RM21 FLASH FILE DETAILS:
Name : Rulex rm21
Cpu : SPD6531E
File : SPRD_SPI_WINBOND_W25Q_4MiB.bin
Download Link : Click Here To Download