Official ASUS firmware update caused R7000 of damage

I have an ASUS Transformer Mini T103HA tablet. After a firmware update from the ASUS website the unit failed to boot. I booked the unit in at Rectron Cape Town and they advised me that the failed firmware update would require me to replace the motherboard as they cannot reflash the BIOS directly. They also said that they need to replace the entire battery and screen, which comes to a value of more than the tablet cost me in the first place. Is this standard procedure? I merely wanted to keep my tablet safe by keeping the firmware up to date and now I need to buy an entirely new tablet because the official firmware update failed? An ASUS South Africa service center agent said that as my device is out of warranty I need to pay the rediculous repair for a device that had absolutely no problems otherwise. ASUS should be held responsible for providing firmware updates that causes a perfectly working device to be *******ed to a level where it is cheaper to buy a new, non-ASUS device with better after-sales service. I am extremely disappointed in ASUS as a company and the poor service I received from them.