Just want to inform you, I succesfully flash my 3GV2 with 4AGE dump image from post link above. I Edited Mac Address to match my sticker (eth0.2 = 0x5E006), default SSID to match the label too. I don't edit the serial number because there is 1 length difference between 3GV2 and 4AGE.
My device become 4AGE with factory firmware 2.28.132, upgrade it to 3.0.24_INT, and later OpenWRT 19.07.4 r11208.
I also backup my spi flash running openwrt and realized it exactly the same as file combined from OpenWrt.mtd0.bin to OpenWrt.mtd7.bin I got from luci (using hash).