Default Ace 2 emergency recovery :/

Hello, so I recently rooted and flashed CM 10.2 on my Galaxy Ace 2 and it can't see the sim card, and I can't call to anyone (it says turn off airplane mode before you want to make a call, even if it's turned off). How do I get back to stock ROM with no root? When I go to download mode it goes straight to ODIN MODE ; CUSTOM BINARY DOWNLOAD: YES (1 counts); CURRENT BINARY: CUSTOM. And my phone doesn't show up in emergency recovery table. It says: "device not responding, to resolve the issue, reboot the device). Pls help