Error after flashing/update software

Hi!
After flashing my M4 Aqua i got error when i turned on my mobile:
"Got Failed TA value at startup! 0x55"
and 2 keys: POWER OFF and Use Phone

After i reflash on Flashtool or use PC Companion to repair error didnt dissapear. Every time i turn on mobile after flashing or after data factory reset i got this error :/ I have locked bootloader and got no root. How to repair it?:(

Download from this link

Android Tablet Software Recommendations Please....

I am constantly encountering 'bricked' tablets and only recently came across a Nexus 7 1st Gen 32Gb. It was locked on the Google Logo but I sorted it with the usual volume and power button combinations. I do get them however when that simply will not work and I see all the different versions of software out there to "flash" or reset these type of Nexus tablets. Can I ask which particular software the readers on here would unhesitatingly recommend please ?? I would really like to be able to delve further into android tablet problems and hopefully solve them. Many thanks for any advice given...much appreciated.

Download from this link

Software update uk

Hi I'm on the giffgaff network and was wondering if or when the latest software update was or if it has been released ota, the firmware version 23.4.A.1.264
Sent from my D6603 using Tapatalk 2

Download from this link

Android Tablet Software Recommendations Please....

I am constantly encountering 'bricked' tablets and only recently came across a Nexus 7 1st Gen 32Gb. It was locked on the Google Logo but I sorted it with the usual volume and power button combinations. I do get them however when that simply will not work and I see all the different versions of software out there to "flash" or reset these tablets. Can I ask which ones the readers on here would unhesitatingly recommend please ?? I would really like to be able to delve further into android tablet problems and hopefully solve them. Many thanks for any advice given...much appreciated.

Download from this link