
Here are few steps to overwrite OEM firmware of a5-v11 router with openwrt.
1) Prepare a FAT formatted USB-Flash-Drive and unzip this a5-v11-openwrt.zip to USB-Flash-Drive. (Important: do not just copy a5-v11-openwrt.zip to flash-drive, unzip this file to USB-Flash-Drive, this folder contains openwrt-factory.bin with needed boot-loader and update scripts)
2) Prepare this...