I know someone made a batch already but here you have mine as well
Easy to use, it will generate the PS3UPDAT.PUP inside the structured directory "PS3\UPDATE\PS3UPDAT.PUP" so can just grab the directory, put it on a usb mass storage device (fat32) and plug it on the PS3 without renaming or doing anything else.
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1- put the official 3.55 PS3UPDAT.PUP in [OFW355_CA595AD9F3AF8F1491D9C9B6921A8C61]
2- run patcher.cmd and wait for confirmation.
3- go to the cfw directory [CFW355_05933BB7A89BEE87B0AA45C74F980E81]
4- copy the PS3 directory to the root of a FAT32 usb mass storage device
5- plug it on the PS3 and install
Edit: here you have my simple CMD batch...
patcher\bspatch OFW355_CA595AD9F3AF8F1491D9C9B6921A8C61\PS3UPDAT.PUP CFW355_05933BB7A89BEE87B0AA45C74F980E81\PS3\UPDATE\PS3UPDAT.PUP patcher\Wutangrza-3.55.patch
gamePKG / FB Alpha RL - [ https://github.com/CaptainCPS ]
FB ALPHA DEV TEAM - [ http://neosource.1emu.net ] [ [url]http://www.barryharris.me.uk/ ]
PS3 - [CECH-2501A][NOR][160GB HDD][MiraLaTijera CFW 4.40 (Core 3.2.0)]