I haven't started yet just I need some clarification before I go. I need to patch my phone using setool2 lite v1.11 and this patch is generated from the main firmware R1CD001, right ?

So this R1CD001 I need to find the firmware or can use R1GB001 ?

Can you give me a list of the files you need and where to download ?
First, you need to know your CID number (erom cid, flash cid, NOT the OTP cid). If it is 52 or lower you can patch it, if it's greater than 52 it may be doable but I don't know how and certainly not by this method.
Second, yes you need the original R1CD001 for patching, and since there isn't one for download you can't patch it the same way I did.
But I presume that you could replace the firmware with some other, R1GB001 for example, and then patch the new firmware.

Ok, now lets presume that your cid is lesser than 52. The patching process would go like this:

1.) Follow the tutorial here and replace the firmware with some other.

2.) After that you can do the paching the same way I did, following this tutorial. Side note: your platform is DB2020 so make sure to read the correct part of the tutorial.

Main points to consider:

- Always make a GDFS backup (one before 1., and one before 2.)
- The battery has to be 100% full to make sure the cellphone doesnt turn off during flashing. Also check the quality of the cable connection, you dont want to lose contact during flashing.
- When you flash, you must flash both the MAIN and FS firmwares, the version of those must be the same (R1GB001 or some other, as long as its the same its ok).
- Also you have to "finalize" by patching the customizations pack, this has to match the FS firmware language (T_MOB_INT_A for example) so choose FS/custom carefully to match your language.
- If you dont know which firmware to choose, I would go with one that has the most FS/customs available for download if you want to cycle them later without having to flash MAIN and patch it up over again.

- After patching all 3 of the above (1st tutorial), your phone will still be locked, but it will be branded/debranded depending on the FS firmware you have chosen. Turn it on after completing the 1st tutorial to see if everything is ok.
- To unlock it, you can follow the guide mentioned under 2nd tutorial.

Hope this helps and good luck with the patching.

Regards,
Narqval

P.S. Although I strongly believe this method will work, it couldn't hurt to verify this with some of the experienced forum members, since i'm still new and inexperienced when it comes to this and had never tested the 1st part myself.