If the maps have the extension .fbl then the they should work with any iGO program as long as it's a cured [cracked] program from here. It doesn't make a difference if it's Android or iOS. FYI, use iFunbox for iOS.

I'll try your version252.
Your links are dead.
thank you

afrer 2.3 version custom map wont work
only original in ipa file

@bam-bam
insn't it possible to add new (2014)maps to the 2.5.2 version?