.img file you downloaded from the links above.Most search results for "RK3128 firmware" will direct you to a file named something like update_RK3128_1080p_20180323.img. Do not use this immediately.
The RK3128 chip can run on hundreds of different boards. The EP-68 board has specific NAND memory chips (often Toshiba or Samsung) and specific Wi-Fi chips (usually the Realtek RTL8188ETV or RTL8723BS). If you flash a generic RK3128 ROM, your Wi-Fi, Ethernet, or even display will break. rk3128 mxq ep 68 firmware link
You need a firmware compiled specifically for the MXQ EP-68 board (V2.0, V2.1, or V3.0). Firmware: The
While the RK3128 ran Lollipop poorly, some users prefer the interface. This firmware is a hybrid mod by developers "Abdul_pt" and "Ricky". Most search results for "RK3128 firmware" will direct
You cannot flash this via the normal "Update & Backup" app. You need a PC, a USB male-to-male cable, and a tool called Rockchip Batch Tool or AndroidTool (RKDevTool).
This is the tricky part. The device must be completely off.
Due to the constantly changing nature of links and the specificity of your request, I won't provide a direct download link. However, I can guide you on what to search for and how to proceed: