Sketches of Lost Heirlooms Pre-Download & Maintenance

Pre-download for the Sketches of Lost Heirlooms version of Arknights: Endfield is now available, giving players a head start before the mandatory update on June 5, 2026. This update brings new content, and Gryphline has provided a clear timeline and compensation details to ease the transition. If you haven't yet, now is the time to prepare your device and schedule.

Stay tuned to the latest Arknights: Endfield news for ongoing coverage and guides.

At a Glance

• Pre-download size (PC): ~6GB (requires 10GB free for extraction; SSD recommended)
• Maintenance start: June 5, 2026 at 06:00 (UTC+8) for Asia; June 4, 2026 at 17:00 (UTC-5) for Americas/Europe
• Maintenance duration: ~6 hours
• Compensation: Oroberyl ×900 (sent via in-game mail; claim before next update)
• Platforms: PC pre-download available now; mobile and PS5 pre-download in development

Pre-Download Guide

PC users can begin the pre-download through GRYPHLINK. A "Pre-Download" icon will appear to the left of the "Play" button. Click it to start downloading approximately 6GB of resources. You can continue playing during the download. For mobile and PlayStation 5, pre-download is not yet available but is expected in future versions.

Version Maintenance Schedule

The mandatory update begins at June 5, 2026, 06:00 (UTC+8) for the Asia server and June 4, 2026, 17:00 (UTC-5) for the Americas and Europe servers. Maintenance is expected to last six hours. During this period, you will not be able to log in. After maintenance, the game client must be re-downloaded (though pre-download reduces the post-maintenance download size).

How to Update

• PC: Close the game, restart GRYPHLINK, and click Update.
• Android: Enter the game and follow the pop-up prompts.
• iOS: Go to the App Store and tap Update.
• PlayStation 5: From the home screen, select Arknights: Endfield, press the OPTIONS button, choose Check for Update, and confirm.

Update size estimates (including extraction overhead):

Platform	Download Size	Extra Temporary Space
PC	6 GB	10 GB
Android	4 GB	4 GB
iOS	4 GB	4 GB
PS5	40 GB	58 GB

※ Temporary space is freed after extraction completes.

Update & Maintenance Compensation

All players who create a character before the update will receive Oroberyl ×900 via in-game mail. The mail expires at the start of the next version update and maintenance, so claim it promptly. This compensation helps offset the downtime for both F2P and spending players.

Pre-Patch To-Dos

• Pre-load on PC: Start the ~6GB download now to save time after maintenance.
• Free up storage: Ensure at least 10GB (PC), 4GB (mobile), or 58GB (PS5) of free space for the update process.
• Complete daily tasks: Any unfinished dailies or stamina-based activities should be done before maintenance begins on June 5.
• Claim mail rewards: Check for any expiring items in your in-game mailbox.

Day-1 Priorities

After the update:

• Download the client update (pre-load reduces this step).
• Log in and claim 900 Oroberyl from your mailbox.
• Check the new content in the Sketches of Lost Heirlooms version.
• Adjust your team and farming plans based on any balance changes (official details not stated in source materials).

Final Thoughts

The Sketches of Lost Heirlooms pre-download is a welcome feature that cuts down post-maintenance waiting time. With clear schedules and compensation, Gryphline is making the transition smooth. Keep an eye on official channels for any last-minute adjustments.

For more guides and updates, visit the Arknights: Endfield hub.