I found a broken, untested backwards compatible PS3 model online which ended up costing me just 11€ and it ended up working! It needs a shell replacement but besides that it works
Install Sony PS3 4.66 Downgrade - video Dailymotion
PS3 Software Update 4.60 - YouTube
4.60 Sony PlayStation 3 PS3 Firmware Konsole Slim in Nordrhein-Westfalen - Elsdorf | Playstation Konsole gebraucht kaufen | eBay Kleinanzeigen
Best CFW for OG PS3? : r/ps3hacks
Sony bloquea todos los ODEs para PlayStation 3 con el nuevo firmware 4.60 - Locos x los Juegos
PS3 4.60 DEMO/kiosk MODE with download - YouTube
PS3 : le firmware 4.60 est disponible - GAMERGEN.COM
PlayStation 3 - Wikipedia
Ps3 4.60 Güncelleme | teknocorba
It seems that Update 4.60 is released. : r/PS3
Download Now PS4 Firmware Update 1.72 and PS3 Firmware 4.60 to Improve Stability
DualShock 4 controller now works wirelessly with the PlayStation 3 - Polygon
Console Modification - Cyprus Console Repairs
PS3 System Update v 4.60 Live Now - Download Link Here | N4G
Free Mobile Gaming - PS3 4.60 Spoof for 4.55/4.50 CEX Standard CFWs Software Download
PlayStation 4 Controller Now Works Wirelessly With PlayStation 3 - GameSpot