Diagnosis and practical fixes for problems affecting classic games, consoles, controllers, displays, and related hardware.
If M+B does not open RetroArch Quick Menu on an RG CubeXX, first confirm a libretro session and use the exact built-in sequence: hold Menu/Function, then tap physical B. This release-pinned guide checks player-1 ownership, scoped RetroArch Menu settings, Full UI, and the N64 Limited Hotkeys exception without destructive resets or config edits.
If Quick Load will not restore a state in a KNULLI RetroArch game, check RetroAchievements Hardcore Mode before assuming the state system is broken. This release-pinned guide explains the disputed Create wording, the consistent Load restriction, the Casual eligibility tradeoff, and a safe FCEUmm test using one fresh slot.
If KNULLI lists a second SD card but still uses Internal storage, verify the selected label and capacity, restart once, and compare User Disk Usage. This source-based guide explains UUID persistence, Internal fallback, replacement cards, ambiguous entries, and why fresh folders do not prove migration.
KNULLI can finish a scrape without displaying box art. This documentation-based guide separates provider errors, no-match results, missing media, theme-field mismatches, skipped games, and gamelist refresh issues across Firefly, Gladiator II, and Scarab using one visible game and Box 2D.
KNULLI Wi‑Fi failures are not all the same. This documentation-based guide separates missing networks, authentication failures, absent IP addresses, disconnects, and band/access-point differences on RG CubeXX across Firefly, Gladiator II, and Scarab—without weakening network security.
KNULLI can be missing from Windows Network even when its SMB share works directly. This documentation-based guide separates discovery, hostname, IP, credential, and read/write failures across Firefly, Gladiator II, and Scarab, including Windows 11 24H2 security constraints.
A KNULLI Missing BIOS warning can come from the wrong active card, path, filename, case, firmware revision, or core instructions. This documentation-based guide explains `/userdata/bios`, KNULLI’s checksum-aware checker, RetroArch Core Information, required versus optional firmware, and Firefly/Scarab scope without providing BIOS downloads.
If a copied game is missing from KNULLI, verify the active `/userdata` storage, use the exact system folder under `roms`, confirm the file format, and run Update gamelists. This source-based guide is scoped to KNULLI Scarab 20260511 on RG CubeXX and does not claim hands-on testing.
If a DOSBox Pure setting seems to reset, save it through RetroArch’s per-game Core Options workflow and verify it after relaunch. This source-based guide covers RetroArch 1.19.1, DOSBox Pure 0.9.9, active `.opt` files, scope conflicts, and the differences between `.opt`, `.cfg`, and `.rmp`.
Analog-stick mouse movement can feel too fast in DOSBox Pure on the RG CubeXX. This guide covers a tested KNULLI Firefly starting point—20% overall sensitivity, 15% deadzone, and 100% horizontal sensitivity—plus per-game saving and verification for the exact tested setup.