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SmokeMonsterPacks / Mega-Sg-Jailbreak

Custom "Jailbreak" firmware for the Analogue Mega Sg
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Mega Sg Jailbreak

NOTE: the latest Jailbreak firmware can now be found at the analoguejb GitHub page. If you have any issues, old or new, please open a ticket there.

Custom "Jailbreak" firmware for the Analogue Mega Sg that allows loading ROMs from the SD Card slot, and an expanded featureset.

Updating Firmware

As shown in this video walkthrough, format a 2GB (or larger) SD card as FAT32 (FAT16 and exFAT are not supported). In Windows, you must use a tool for cards larger than 32GB, such as fat32format.

Extract everything to the root of your SD card and be sure to remove any existing firmware file. Place BIOS files in the BIOS directory. Insert the card into your Mega Sg and power on. The firmware will be flashed to the console. This process may take a few minutes.

While the firmware is flashing the LED will turn red and flicker, followed by a considerable pause and HDMI signal blackout. Do not power off. The main menu will boot when it has finished. Delete the firmware file from your card after flashing.

The Mega Sg is protected from bricking as a result of firmware updates, but please still follow the above precautions to be safe.

Organizing ROMs

An empty folder structure is included. Drop your ROMs into these subfolders (see SmokeMonster's database for curated lists of ROMs). When loading a core, the Mega Sg will automatically enter the corresponding subfolder. The maximum number of files (ROMs and subfolders) that can be placed in a given folder is around 300-500, depending on the length of the filenames.

Running ROMs

Select browse SD card from the main menu. Hit enter on a filename to run it, or if it's a subfolder, it will enter said folder. The menu hotkey will return to the file menu from the game.

Saves

NEVER insert or remove cartridges while your Mega Sg is powered on. Doing so may risk damaging the console and/or losing saves. It is good practice to backup saves before updating firmware.

When a game is exited to the menu, it will prompt you to save. Return to the file menu and save your progress before powering down.

Fonts

The System -> Font menu allows you to select your own font in place of those which come with the console. The load font option will bring you to the file browser. If you have a directory called /FONT/ at the root of your SD card, it will default to that directory to load a font file. The font must use an 8x8 text box and must be represented in binary in a 1-bit per pixel format. Each character will take eight bytes to represent in this format. The file must be 768 or 1024 bytes in size and use the extension .fnt. The characters in the file will have to start at ASCII 20 (space) and end at ASCII 7F (delete). Font files 1024 bytes in size will not show the first 32 characters which would be stored in the first 256 bytes of that file. A set of user-created fonts compiled by Sho is available here. Utilities to convert Analogue font files to/from bitmap files are available here.

Changelog

Warnings

Cores Supported

Other Features

Problem Reporting and Community Chat

The custom firmware is not coded by SmokeMonsterPacks or frederic-mahe, but please do report problems here at GitHub for support. Priority will be given to jailbreak-specific problems (using ROMs through the SD card slot rather than through the cartridge slot). Feel free to also submit issues for non-jailbreak related problems. You can join the FPGAming Discord to chat or troubleshoot in

analogue-mega-sg

Use at your own discretion. We are not responsible for any damage or data loss caused by custom firmware installation or use.