You have to used the search function!!!
There are at least 50 postings about flashing CID53. Untill now, there is not free solution. XS++ and Setool2 lite are not able to access cid 53. The XSPP-Team is working At a new version of XS++
You can flash CID53 with setool3 box which is a hardware and cost around 200 $
Another possilility is to use the D-Client oe Davinci-Client.
Both are not for free. It means you have to pay some logs or credits. DClient logs you can buy at this webside directly for davinci you have to go to the webside: DavinciTeam - Welcome on our Site.....
I have good experience with davinci, but it is more expensive.
Best Regards