GT-I9300 Unusual Version of "Not Registered To Network"

Hello. :)

I have read as many posts/forums that I can find on XDA (plus or minus a few I may have missed) and I have not found something matching my situation. While there are many revolving a missing, corrupted or invalid IMEI, this does not seem to be my case, at least according to my phone.

I am new to rooting, posting on XDA, and unlocking a phone

The beginning:
I had a locked, unrooted GT-I9300. Out of nowhere, I start getting "not registered on network." I had already decided to go with a different carrier/network and purchase a different phone. (The phone was on a contract that I did not continue after it expired. ) Circumstances necessitated that I keep this phone and just use a different carrier. I figured I would have to fix the "not registered on network", unlock the sim, and root the phone (not necessarily in that order.) I looked up several different articles , both through XDA and Google, that talk about the "not registered on network."

What I have done:
None of the non-root methods worked for my phone. According to the phone, I still have my original IMEI and S#. At this point I decided to root my phone. I have TWRP recovery and am currently running on the original stock ROM as I didn't want to risk corrupting (maybe further corrupting) my IMEI, etc. I will list full phone status below. After rooting, I tried to use GalaxSim unlock app (an older version than what is at the Play Store, due to it not being available in my country due to laws.) It states that my IMEI, S#, etc are: undefined. It also says it is unable to read my nv data.


I am afraid to try any of the nv data fixes with out double checking first, as according to my phone my IMEI and S# are correct.

Full Phone Stats:
Model #: GT-I9300
Android Version: 4.3
Baseband Version: I9300UBUGMK1
Kernel Version: 3.0.31-2320216
se.infr@R0301-08 #1
Wed Dec 18 03:37:30 KST 2013
Build Number: JSS15J.I9300UBUGML1_CellOnell_v2.0

Network: Unknown (according to phone information, branded CellOne phone, have both CellOne sim and Straightalk sim)
Signal Strength: -103dBm 6 asu (as I type this)
Mobile Network Type: GPRS
Service State: Out of Service
Roaming: Not on Roaming
Mobile Network State: Disconnected
Phone Number: Changes upon which SIM I put in the phone. Original CellOne SIM has no number connected to it. Straightalk
pops up the right number for the SIM card.
IMEI State: Original IMEI that came with the phone (found in the phone, on the information box, and back)
IMEISV: 01
IP address, WiFi Mac Address, Bluetooth address: Will supply if needed
S# State: Original S# that is for the phone (found in the phone, on the information box, and back)
Device Status: Custom

As stated above, my phone was giving me the network connection error BEFORE I messed with rooting, etc.

Unusual battery behaviour

Hi,
I bought this tablet (Tab S 10.5 LTE, model number T-805) on September 2014. In the last month I'm experiencing weird battery behaviour, like the one in the screen attached. I had about 50% of battery charge and I started a game like Angry Birds 2.
In a matter of minutes, the tablet warned me that the battery charge was under 15% and after another minute the under 5% charge warning message appeared.

Questions:
1) is the tablet battery already worn out? Do you know if Samsung European warranty cover battery problems?
2) Before sending the tablet back to Samsung, should I try recalibrating the battery? I have an old power adaptor with 5V 0,7A (or 5V 1A), should I try a a "slow charge" to see if the battery situation improve?

I have the latest firmware, lollipop 5.0.2 and I did a factory reset after the update.



Thanks in advance,
bye

razr i unusual brick

First , excuse me because I do not speak English fluently and am using a translator

I tried installing a ROM from cm11 that I found here in the forum , but installing spoke to the screen image and was caught on the second screen . it will restart twice and at this screen . someone help me please:crying::crying::crying:

Unusual Error with Galaxy Note 3

Yesterday morning I found myself unable to make outgoing calls on my Galaxy Note 3. Every call attempt sends me to my own voicemail. Text messaging and data work, the issue is just with voice calls. I've tried rebooting, clearing the cache and rebooting, hard and soft resets nothing works.
I brought into a Sprint store and they couldn't fix it so I went home and installed a stock ROM, When that didn't help I ended up calling Sprint tech support. After half an hour and multiple attempts by the Sprint phone tech I was finally told I needed to be transferred to Senior Tech. As I was waiting to be transferred the line went dead. I eventually did call Sprint again and they reactivated the phone as well as a few other things but still nothing has worked.
Today I discovered that the calls I am able to receive are only from other carriers and/or from landlines. All calls from Sprint accounts go straight to my voicemail just like my outgoing calls do. I called Sprint tech support again to update them and they were surprised to hear this.
Two different Techs called my phone from their offices to confirm and sure enough I answered. They had to clue hot to fix this.
To me this indicate it's a Sprint network problem and not a problem with my handset. Even changing my phone number wouldn't resolve the problem, in tech's opinion.
So they opened a support ticket but I am not optimistic this can be fixed. I'll give them a couple days to try but if they can't I'll be forced to close my account which, after 15+ years, is a shame.

Unusual note 4 firmware update

I have a rooted note 4(so i dont get OTA updates) and kies showed me a firmware update which was 1.8gb download and extracted to a 3.2 gb md5 file.
i upgraded my phone without modifying root.
My firmware is still at 5.0.1
nothing has changed except the sure thing:- root vanishing up and samsung blotware apps returning.
Don't understand what was the update.

Also, now with no root my OTA still doesnt work and shows an error message that i have modified firmware.
is that because of knox??