As it mention in subject psx still has the crashing issue on jailbroken A7 devices running iOS 8.1. we had this issue since the iOS 7.1 Jb via Pangu. I used to pangu8 v1.0.1 to jailbreak iphone 5s running iOS 8.1. I tried some of the other cores, they are working fine except Playstation1 (PCSX ReARMed). Do not jailbreak your device running iOS 8, because there is no cydia available yet. I managed to install retroarch 1.0.0.2.1 by convert it to ipa and installed using zeusmos. I installed retroarch before the jailbreak but non of the cores work, I only get a message that the content fails to load. I know this is really bad news for retroarch’s devs and users, and I hope evasion dev team release their jailbreak for iOS 8.1 that supports dynarec for all devices.
update: actually retroarch works on non-jailbroken iOS 8.1 after I restored the the device, all the cores are working except the Playstation1 (PCSX ReARMed).