Desktop Operating Systems and Recovery

hi tech support... to my dissatsfaction with HP im hoping tomreach out to someone that can help recover me as a customer.  my story/issue briefly.  i bought the hp23-p027c in hopes that this slim touch screen design wpuld serve me for years. However, just after 8/9 months of basic use the pc all of a sudden never turned back. I did not have time or energy to fuss with it so i boxed it up to open up jist recently and searched online a simple fix of resetting the cmos by removing the battery (really?)  once i fixed this issue i looked for a bios upgrade amd there it was, file 80.20 bios upgrade.  I followed the prompts and got a succesfull upgrade... Now for the real issue. It will not boot up now and stays stuck at the hp logo with ocassionally showing entering repair mode.  I found this is a common issue so i followed all of the intructions in hp forums. I downloaded the roll back 80.19 and created the usb boot device... i booted the pc to bios and configured to legacy and booted to  usb but got NO boot NO startup just a blinking cursor.  Ok went with the F2 and tried using the  HP system diagnostics screen (both pc version and usb version ) to flash bios firmware but ofcourse it didnt work because it says update failed bios image specified did not pass validation. Now i have a dead pc after i used hps bios update and wont recognize new bios firmware for validation reasons.  Please help i would hate to trash this pc or have to replace the motherboard which i did not break!