[sohojmanush]

I have iPhone Xs max which is carrier locked, more precisely "Locked to AT&T at next activation. Right now it is only unlocked for GSM." So, I can't reset it neither I can update it to. If I update or reset it will become locked to AT&T once again. But, I want to update it to 12.4.1. I dont want to update it to iOS 13 , because it removed the 3d touch. I have tried tsssaver.1conan and 3U tools but those option failed. Suggested method requires jailbraking , but then again that will require resetting and lead me to a locked device. So, is there is a way to save the 12.4.1 blobs that apple is currently signing without jailbreaking? Currently the device is stuck at iOS 12.1.4 and it was hard to resist an iPhone as gift  Also, if anyone know a reputable carrier unlock service that not a scam will highly appreciate the suggestion. Currently trying to unlock it with the original purchaser , but by the time he will do apple will stop signing ios 12.