EZ-FLASH Junior for GB/GBC on
GBA/GBA SP
Features:
GB/GBC game copy and play
Instant load the game
Real time clock
Fast reset to menu
Maximum game: 64Mbits
Maximum save: 1Mbits
Mapper supports:MBC1,MBC2,MBC3,MBC5
Support Gameboy, Gameboy Pocket, Gameboy Color, Gameboy Advance/SP, even with backlit mods and rechargeable batteries.
System on chip level recovery mode, prevent upgrade dead
Support FAT32 4-32GB SD card
Firmware and kernel both are upgradable
Replaceable battery design

Video tutorial:
https://www.bilibili.com/video/av79946459