In Once Human, Blueprint Conversion transfers star levels between eligible unlocked blueprints. The latest official update located confirms that the blueprints must have the same rarity; the detailed instructions also require the same gear type and say each conversion uses one attempt. This is separate from converting legacy blueprint fragments into Starchrom.
What Blueprint Conversion does
Blueprint Conversion swaps the star level (called a rating in the original instructions) of one unlocked blueprint with that of another eligible unlocked blueprint. The March 25, 2026 Version 2.3.5 update announcement confirms that star levels can be transferred between blueprints of the same rarity.
The detailed October 2024 instructions add that the two blueprints must also be the same gear type: weapon to weapon or armor to armor. They must both be unlocked, and each conversion consumes one Blueprint Conversion attempt. Because that gear-type requirement comes from older instructions and game rules can change, check the live Blueprint screen if its current eligibility display differs.
How to use Blueprint Conversion
Open the Blueprint screen in-game and use its Blueprint Conversion feature to select the two eligible unlocked blueprints. The published instructions establish the eligibility and attempt cost, but do not provide a stable menu path beyond the Blueprint screen; follow the current on-screen prompts to complete the swap.
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- Choose two unlocked blueprints of the same rarity.
- Confirm they are both weapons or both armor, as specified in the detailed published instructions.
- Review the selected blueprints and the attempt cost in the live interface, then confirm the conversion if the displayed details are correct.
How many conversion attempts are available?
The official attempt rules changed over time, so the dated figures should not be confused with an always-current guarantee.
| Official guidance | Published attempt rule |
|---|---|
| Version 1.3 instructions, October 17, 2024 | Maximum of 10 held attempts; recovery was described on first unlock, at a new season, after a seasonal balance adjustment, and at a fixed weekly time. |
| Cross-Character Sharing rules, March 21, 2025 | After cross-character sharing is enabled, the limit increases to 15, with six conversions automatically recovered each week. |
The March 2025 rules are the later published attempt guidance. Check the in-game screen for the current cap and recovery timing on your account and server.
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Blueprint Conversion is not fragment-to-Starchrom conversion
The March 2026 blueprint overhaul changed how blueprint progression works: players activate and upgrade blueprints directly from the Blueprint screen with Starchrom rather than drawing and combining blueprint fragments for that progression. Blueprint Conversion remains a separate feature for transferring star levels between same-rarity blueprints.
The same update also describes automatic migration of existing Blueprint Fragments into Starchrom. Its published formula is Starchrom = Fragment Exp × 1.85. That formula applies to the fragment-to-currency migration—not to Blueprint Conversion, and not to the transfer of blueprint stars.
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