APC Symmetra SYBT5 EEPROM patcher

Patches binary dumps for re-program it back into the battery block controller's EEPROM chip.

Removes error records by zeroing corresponding bytes. Optionally it can change manufacture date and serial number (with checksum recalculation).

This is a pure C remake of the Python implementation: https://github.com/atmega1337/sybt5fixtool

Usage

sybt5patcher.exe eeprom_dump.bin

Or just drag-and-drop EEPROM dump file on top of the executable (Windows).

It will ask you for Serial Number and Manufacture date change. You can confirm that or reject (default), if you need to change S/N and manufacture date.

At the end, it will create a patched file in the current working directory, named with suffix -fix.bin.

Binaries

Available in the Releases section. If you need another architecture or OS, you can build a source for your specific architecture or OS.

Building

Source code is written with C89 compatibility.

It can be compiled on Windows, Linux and DOS with appropriate building tools.

with makefile:

make

Manually

With gcc:

gcc -std=c89 -O2 main.c -o sybt5patcher

On Windows, change sybt5patcher to sybt5patcher.exe

With MSVC:

cl /O2 /Fosybt5patcher.obj main.c /Fesybt5patcher.exe

DOS:

Using Turbo C or another tools, such as DJGPP.

Warning

• Use it at your own risk
• Exitsting files will be overwritten!
• DOSes have filename length limitation of 8 characters (excluding extension). If you are planning to use this software in DOS, make sure your input EEPROM dump file name is shorter than 8 characters.

Short note about flashing with CH341A

EEPROM 93Cxx chips require special pin redirection. Do not put it right away onto CH341A without proper preparation.

Pins numeration on 93Cxx chips (and for BIOS part of CH341A programmer):

Left	Right
1	8
2	7
3	6
4	5

Pins redirection

Left column: from chip

Right column: to CH341A

Empty: don't connect

93Cxx	CH341A
1	1
2	6
3	5
4	2
5	4
6
7
8	8