Changelog for FMCB/FHDB
Changelog for v1.964:

Replaced bad HDDLOAD.IRX (fixed booting of FHDB on SCPH-10000, SCPH-15000 & SCPH-18000).
Increased maximum item count to 200, reduced maximum length to 128.
Changelog for the installer
Changelog for v0.983 (As of 2018/07/04):

Added option to format the HDD unit, if not formatted.
Updated translation template.
Rebuilt to have the fixed PFS driver.
Updated FSCK to v0.961 - fixed checking of PFS partitions.
Updated LaunchELF.
Corrected logic error in UI that prevented FHDB from being installed.
Updated FSCK, to also correct the same logic error within it.
Updated LaunchELF.
Updated USBHDFSD, so that dumping of memory cards can be done safely.
NEW - Pressing the back button at the keep CNF screen will abort the installation.
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Changelog for v1.965:

Updated USBD & USBHDFSD for compatibility with devices that have only one Alternate Interface configuration.
Updated LaunchELF.
FMCB Configurator: fixed bug that prevented the PS2 from being switched off when there is no HDD installed.

NEW 2018/10/27 - Updated USBHDFSD: fix bug that prevented correct reading & writing.
NEW 2018/11/03 - FMCB Configurator: prevent potential crash if config file cannot be opened from device, by not closing the FD if it was not opened.
NEW 2018/11/03 - FMCB Configurator: Avoid accessing the HDD unit, if possible.
Attempt to load configuration file from the device that it is booted from, before trying all other devices. When attempting to load USB modules, check memory cards before the HDD unit.

Changelog for v0.985:

Added font glyph caching, to improve on font-drawing performance.
Updated LaunchELF.

Changelog for FMCB/FHDB
Changelog for v1.966 (as of 2019/04/13):

Added system shutdown function. The corresponding special menu item is "POWEROFF".
Renamed "Reload Configuration" to "Restart System".
Updated USBHDFSD & HDD modules to reduce wear on some 2.5" HDDs (USB and the PS2 HDD) when the PS2 is shut down. The User should use the shutdown function to shut down these devices properly.
Updated USBHDFSD to fix the performance problem from 2014.
(FHDB) Recompiled FSCK with new HDD modules.
Recovery mode will now once again be entered as long as mass:/RESCUE.ELF is found. The START+R1 combo can still be used to force it (FMCB/FHDB will make an infinite number of attempts to boot it).
NEW 2019/01/14 - (FHDB) Added Japanese translation for FSCK. Special thanks to Oga.
NEW 2019/01/14 - Updated USBHDFSD to fix the bug causing files to be unable to be replaced properly.
NEW 2019/04/13 - (FSCK) Replaced Japanese font with NotoSansJP-Bold, to reduce space wastage.
Changelog for the installer
Changelog for v0.987 (as of 2019/04/13):

Replaced Japanese font with NotoSansJP-Bold, to reduce space wastage.
Cleaned up source code in SECRMAN to be more readable and better representations of the original.
FMCB installation folders are now marked as non-transferrable in the browser.
Known issues (installer)