Normally, I wouldn't start a help thread here, but I've never had problems like this with Sidestore in recent years.
Okay, the current issues with IKEv2 VPN, etc., are all well-known. There's now a fix from iLoader, so let's start from the beginning:
I uninstalled everything. No Sidestore, no LiveContainer, nothing.
I downloaded iLoader version 2.1.1 (the latest as of April 5, 2026). From there, I downloaded Sidestore Nightly. The pairing file was also automatically created and saved there.
I'm now launching Sidestore and logging in as usual with my Apple ID. Everything is as usual. I refresh Sidestore, and after a few seconds, the following message appears: "Side Store could not determine this devices UDID. Please replace your pairing using iloader"
So again i open iloader, click on "Managing Pairing File" and select the one which is shown. Same issue. I tried idevice_pair and manually put the pairing file in sidestore. Same issue.
Is this issue related with VPN, yes or no? If not im confused. If yes, how EXACTLY do i need to setup LocalDevVPN right now? M yrouter hat the ip 192.168.178.1, my iPhone 192.168.178.69. Empty ip addresses in my network are 192.168.178.58 and 192.168.178.59. So i entered in localDevVPN 192.168.178.58 as device IP and 192.168.178.59 as tunnel IP. Same Issue.
I take a look after enabling VPN in the new Sidestore VPN settings called "VPN configuration". Sidestore automatically grabs the tunnel IP and subnet mask, thats it. Device IP is N/A and Active is "no".