w|fiveighty

In this informational post, we will briefly explain

• what the basic contents of a patch are
• what happens during error checking
• and the logic behind removing a patch

** IMPORTANT NOTICE **

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Information listed in this site has been proven correct before. If you believe that any information is wrong, and you have the right answer to it, please contact the Site Administrator

Take this patch for W580 R8BE001 for example:

;W580 SW-R8BE001 
;Reduction of time of deduction of the keys 
;Faster moving through items , menus ... 
;© IronMaster 
;(p) MysticBeast 45357902: FA80 C820

;W580 SW-R8BE001
;Reduction of time of deduction of the keys
;Faster moving through items , menus ...
;© IronMaster
;(p) MysticBeast

Everything that starts with a ';' means its a comment and will not be read by the patching software.
It usually tells you info about the patch. The phone and version its made for, followed by the description, followed by the person who made it, followed by the person who ported it to that phone.

45357902: FA80 C820

Is the main part of the patch.

45357902:

Is the address where the value needs to be changed

FA80

Is the original value of this address (So that it can be removed in the future, and also to check if it matches)
(If this value differs, it will output a 'byte mismatch' error, sometimes also indicating the line number)

C820

Is the value to replace that original value in that address.

Thus, when you remove a patch, the software reads in the 3rd set of address as the 'original' value, and takes the 2nd set of address as the 'replacing' value, i.e. 'swapping' the 2nd and 3rd set.
With that logic, any byte mismatch you occur when removing a patch will be because the 3rd set of address does not correspond with the current value in the MAIN.

Pretty simple logic, isn't it?

[Originally mentioned here]