Slow net conection,low quality in games after updating my N8010 to kitkat topic

Soo as the title say when i connect to wi fi net the connection is somehow slow i mean for example when i go in youtube and when i open a video it just loads to long no mater on what distance im from the modem the same goes for browsing by my ap Opera browser for android and also the download speed is slowed after the update and second problem is low quality in games for example i just downloaded asphalt 8 airborne on my tab and when i opend it the begining screen was in a black and white flag i mean i see the menus but the car in the background is like in a back and white flag on high visual quality but when i set it on low visual quality it fixes but its in low quality like in 480p XD ow and i almost forgot the batery somehow drains fast now soo this happends after i updated my Sasmung galaxy note 10.1 N8010 from 4.1.2 to kitkat 4.4.2 soo please help me :crying:
i didnt had does problems before btw

Im sorry for my poor english but i dont know what to do and IDK if there is another threed like myns if yes sorry again but i need help fast x<

[Q] What type of brick is my Galaxy note 10.1 gt n8010 stuck? topic

Two days ago my Galaxy Note 10.1 gt-n8010 got stuck at the initial screen (Samsung Galaxy Note 10.1)
It was working normally, and it was last successfully upgraded to a custom rom and CWM 6.0.3.6 a month ago.
The custom rom was (to my best knowledge Android Revolution HD 11.2 - 4.1.2)

Booting into recovery and download modes works.
CWM recovery works partially. Erasing Cache en resetting to factory works, and sometimes results in getting to the second splash screen of the boot process where it again gets stuck (Samsung animation keeps glowing), but more it keeps getting stuck at he first boot screen.
Erasing Dalvic cache leads to immediate reboot.
CWM log files cant be opened / external sd card can't be reached/mounted.
So CWM is only working for a small part.
I've attached images of the CWM screens including a log-screen that shows that files and folders cannot be found.

Using ODIN, to flash a new CWM or custom/original ROM result in a FAIL message.
Tried different ODIN version, two original Samsung data cables and two computers. Alle the same result. FAIL.

I'm hesitant to continue now without some help. I might do more harm and destroy all chances there are to recover this tablet.

I've flashed all my phones and tablets before. I'm not an expert, but never had a mishap, because I triple read the instructions. The situation that arises now is not a result of a failed upgrade/flash, but suddenly appeared one morning.

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