AC6 Booster Patch History: All 12 Changed (Reg. 1.09.1)

Short answer: boosters in Armored Core VI were adjusted many times after release. Twelve boosters are named in Bandai Namco Europe's official patch notes (1.02 to 1.09), and all 12 were adjusted at least once. IA-C01B: GILLS was adjusted five times and FLUEGEL/21Z four times. This article does not give a table of stats, because we could not confirm the current (Regulation Ver.1.09.1) values from any official source. Instead it lists what the official patch notes show: when, which booster, and what changed.

The version covered is Regulation Ver.1.09.1, the version shown after applying patch 1.09 (announced in Europe on 23 May 2025). The latest patch notes we could confirm are this 1.09. Later updates (16 December 2025 and 18 September 2026) are recorded on this site as not affecting in-game balance.

Why there is no stat table

• Online comparison tables can contain old numbers. The Fextralife Wiki page for ALULA 21E says "last edited on 24 August 2023" and lists Upward Thrust 4650. But patch 1.03.1 (5 October 2023) increased Upward Thrust on 10 boosters, including ALULA/21E. A page last edited on 24 August cannot reflect that change.
• The Upward EN Consumption shown for ALULA/21E was wrong until 1.09. The official notes say 1.09 fixed the value displayed on the parts-spec screen (a Japanese report describes it as a mismatch between internal data and the displayed parameter). Older tables may list a figure that differs from the real performance.
• The official notes give only the direction of each change, not the values before and after. So you cannot rebuild the current numbers by following the patches.

To see the numbers, check the parts-spec screen in the Garage. When you use an outside table, first look for the Regulation version and the update date.

Booster changes by patch

Dates are those of Bandai Namco Europe's official announcements. They are not necessarily the deployment dates.

Of the patch notes we read, 1.02, 1.03, 1.04, 1.07.1 and 1.08.1 list no booster changes. 1.08.1 changes the CORE "AC-J-120 BASHO" (Booster Efficiency Adj.), which is a core stat, not a booster. We could not find the notes for 1.01 and earlier, or for 1.08 (the version before 1.08.1).

Adjustments per booster

• Ten boosters were first adjusted in 1.03.1 (Upward Thrust increased). BUERZEL/21D and BC-0200 GRIDWALKER were not part of 1.03.1.
• BUERZEL/21D got higher QB EN consumption and lower AB Thrust in 1.05, then lower QB EN consumption in 1.07. The notes give no values, so we cannot tell how much the 1.07 change offsets the 1.05 change.
• Melee Attack Thrust was increased on FLUEGEL/21Z (1.06 and 1.07), BST-G2/P06SPD (1.07) and BC-0200 GRIDWALKER (1.07). This is part of the background to our melee build article, which says melee builds are easier to land than before.
• No change since 1.03.1 is confirmed for AB-J-137 KIKAKU, BST-G1/P10, BC-0400 MULE and IB-C03B: NGI 001. ALULA/21E only got the 1.09 display fix.

Reading outside tables

Prima Games explains the stat terms well. The wording may differ from the in-game text.

• Thrust: how fast you move under thrust.
• Upward Thrust: vertical thrust speed and distance. Upward EN Consumption is the EN used by vertical thrust.
• QB Thrust: the speed of the initial burst of a Quick Boost. QB EN Consumption is the EN a Quick Boost uses, and QB Reload Time is how long before you can Quick Boost again.
• AB Thrust: the thrust of Assault Boost; AB EN Consumption is the EN it uses.
• Melee Attack Thrust: how fast your AC thrusts forward when making a melee attack.

★QB Reload Ideal Weight is the weight up to which the listed QB reload time is kept; how it works above that weight is explained only briefly in the sources we could read, and we could not confirm from an official source how much slower the reload gets above that weight. When you compare numbers, also check your AC's total weight in the game.

What we could not confirm

• The current (Regulation Ver.1.09.1) value of any booster. The official notes give no before-and-after values, and the outside tables we found were either undated or from August 2023.
• Patch notes for 1.01 and earlier, and for 1.08. We could not find the Bandai Namco Europe pages, so booster changes in those versions cannot be ruled out.
• The Japanese in-game stat names. The stat names here follow the English patch notes; we checked the Japanese names only for those used in the Game*Spark (1.09) and Game8 pages.
• Actual deployment dates. We checked only the dates of the European official announcements.

Sources

• Bandai Namco Europe: Patch Notes 1.03.1 (5 Oct 2023)
• Bandai Namco Europe: Patch Notes 1.05 (19 Dec 2023)
• Bandai Namco Europe: Patch Notes 1.06 (5 Feb 2024)
• Bandai Namco Europe: Patch Notes 1.07 (19 Sep 2024)
• Bandai Namco Europe: Patch Notes 1.07.2 (29 Oct 2024)
• Bandai Namco Europe: Patch Notes 1.09 (23 May 2025; Regulation Ver.1.09.1 after applying)
• Game*Spark: Japanese summary of 1.09 (the ALULA/21E display mismatch)
• Fextralife Wiki: ALULA 21E (page last edited 24 Aug 2023)
• Prima Games: AC6 stat and part spec terms explained

Summary

• All 12 boosters named in the official notes (1.02 to 1.09) were adjusted at least once. GILLS five times, FLUEGEL four.
• The official notes give only the direction of change, not values. Check an outside table's version and date, and when in doubt read the parts-spec screen in the game.
• ALULA/21E's Upward EN Consumption was displayed wrongly until 1.09. Do not trust old figures as they are.

Related: Melee build guide (what changed in 1.09.1), Light reverse-joint stagger build, Strongest melee build