The author expresses frustration at being told by Advantage Air that they needed to replace the entire control system for $1245 when only the cheap tablet failed. After unsuccessful attempts to fix the tablet, the author takes matters into their own hands by discovering a hidden USB port and modifying the software to work with an old tablet they found. By using tools like apktool and JAXE, the author successfully gets the old tablet to work with the AC system. The author shares a step-by-step guide on how they accomplished this, emphasizing the satisfaction of solving the issue independently rather than paying a high price for a replacement.
https://blog.hopefullyuseful.com/blog/advantage-air-ezone-tablet-diy-repair/