Please advice on my rollercoaster ulocking k800i

Today I decided to try to unlock this, i never worked with unlocking before so all very new.

I spent 8 hours and still not working hopefully someone can help.

First I made the mistake of going to another forum from google and they said I should use SEUS - then after doing this I realise this is bad... after using SEUS and it made CID 53 =/ I thought this meant I'd ruined everything... however I saw a thread on here that said if that happens you should take the firmware to K810 53 firmware... So I managed to get to grips with far manager after some time and the great tutorial. Flash K800 CID53 with K810 software CID53 (for begginers) - Top Sony Forums

Not sure why this needed to be done I guess this is the debranding part? but I managed to do this by following the tutorial and all worked fine. Now I try to use SETOOL lite to unlock with a tutorial I have that says I should put main file in 'add' file, and then put patch file in misc - then click flash...

So I tried using the main k810 file I used from the tutorial i linked earlier, and a patch I have for r8 k810 unlock in the misc but it doesn't work...

I get this message..

Welcome to SEtool2 ( LITE edition ) v 1.11
supported DB2010/DB2012 CID49/50/51/52, DB2020 CID49/51/52
Loaded 51 flash descriptors

if you like LITE edition - please visit http://www.setool.net and buy FULL.

ChipID:9900,EMP protocol:0301
PHONE IS RED RETAIL PRODUCT
FLASH CID detected:53
Speed:921600
OTP LOCKED:1 CID:51 PAF:1 IMEI:xxxxx CERT:RED
FLASH CID:53 COLOR:RED
Can't build loaders chain ;(
Elapsed:6 secs.


So phone still not unlock - the patch to put k810 firmware on it seems to have debranded it all good - as it's no longer showing virgin logos, but I'm trying to figure out how I now unlock this so I can use my tmobile sim...

ANy help really appreciated thanks