Can I fix this NEO GEO calendar error?

Last year I bought myself a NEO GEO MVS, its one of those systems I've always dreamt of owning so got this from Aliexpress along with a supergun and all in one game cart. All was going well until just before Christmas when it threw up a calendar error. I've been missing my arcade games fix so let try to fix it or least find a work around... NEOGEO schematics - https://wiki.neogeodev.org/index.php?... NEOGEO unibios - http://unibios.free.fr/ CRG Twitter -   / yt_crg   CRG Patreon - https://www.patreon.com/user?u=13919007 CRG Discord -   / discord   End music - Modspire by ‪@NaokisRC‬ Music bed - Lorraine's Friends by ‪@Momentvm‬ Chapters 00:00 Intro 00:48 Closer look 04:09 Is it just the crystal? 04:38 What about the RTC chip? 08:36 Voltage levels? 11:44 Calendar error checks 17:04 The soldering bit 20:29 Unibios 27:35 Testing 31:35 Conclusion and credits