Arknights: Endfield error codes and crash fixes
Every error, crash and connection failure we have a fix for, one page per code. Before the fix, each page says whether the problem is your machine or the studio's servers — because if it's theirs, no amount of verifying game files will help, and the only useful answer is whether it's happening right now.
7 pages · last checked October 16, 2026
Things you can fix
Crashes, install faults and driver conflicts. Find your symptom, work the steps in order, stop when it launches.
Arknights: Endfield on Steam starts at the prologue: link fix
You started Arknights: Endfield on Steam and landed at the prologue on a new account, or the email verification code for "Log in with existing account" never arrives. Or unlinking says "Unlinking failed. This account can only be unlinked from a Steam account once every 180 days."
Arknights: Endfield stuck at "Releasing Resources 0%" (fix)
After launching the Arknights: Endfield PC client and downloading in-game update resources, the screen freezes at "Releasing Resources 0%" and you can't get into the game.
Arknights: Endfield error code 207 (unstable network)
A download or update stops with "Unstable network connection. Please check your connection and try again. [Error code: 207]".
Arknights: Endfield "ACE error" at launch: file check fix
Arknights: Endfield shows an "ACE error" every time you try to start it on PC, so the game won't launch. Reports mention Ace-Service64.exe, part of the game's anti-cheat.
Arknights: Endfield "Game initialization has failed" error
Arknights: Endfield on Steam shows "Game initialization has failed. Please confirm and restart the game." The only button, Confirm, closes the game.
Arknights: Endfield crash, stutter or login problem (official fix)
Arknights: Endfield crashes, stutters, or won't get past login. There's no error code, just the game closing or freezing.
Arknights: Endfield error code 4004 when buying (Epic): fix
Buying in Arknights: Endfield from the Epic Games version fails with "Error code: 4004", before the game lets you reach a payment method.
Things you cannot
Queues, capacity limits and login failures. These are server-side — every page below links back to live status rather than a fix you can perform yourself.
None logged yet — check back as reports come in.
How these are graded
Every fix step carries a label. Confirmed means players demonstrably got back in with it, or the studio said so directly.Reported means it worked for some people and not others. Unconfirmed means it's circulating and there's no evidence either way yet. The distinction is the point — a page that lists five fixes with equal confidence costs you an evening.