Guide On Patching Boktai To Work With OPEN_AGB_FIRM

[Maxwellp]

I just wanted to make a quick guide on how I think EEPROMV122 games can be fixed from not saving on the newly released Open_Agb_Firm for 3DS. It took lots of testing and frustration so hopefully someone will find this for themselves and implement it in an easier way.

A dumped Boktai rom needs altered in 3 ways: SRAM patch, IPS patch, and SRAM Hex edit. The downloaded tools needed for this are GBA Tools Advance(gbata), a sunlight IPS patch (there are several), and any free hex editor(I use HxD.) Of course you'll need the open_agb_firm installed on your 3ds too.

1. Open gbata.exe and select your boktai file.

2. Select the SRAM Patcher tab and save location/filename. Patch the rom.

3. Select IPS Patcher tab and use your sunlight patch.

4. With your fully patched rom, open it in a Hex Editor and search for 'EEPROM_V122'

5. Replace the values as shown and save the file.

6. Drop the completed ROM on your SD card and test running from Open_AGB_Firm. It should default to using the default mode 14 (sram 256k) to save.

I've tested this playing off and on for over an hour with no save issues so far. Sunlight and plant growth works as well. I've also done the same with Yoshis Island with success.

 

[Chopito]

Thank you creating and sharing this guide.

Does the RTC work with OPEN_AGB_FIRM? I tried playing this game as a CIA inject (using NSUI), but the clock resets every time I exit the game.

Also, there is a Sleep option in the pause menu. Do you know if the 3ds goes into sleep mode using that option?

Thanks again!

 

[Maxwellp]

I assumed plant growth was part of rtc so assumed it worked in agb firm.

Sleep mode is only partially implemented, not fully.

 

[Chopito]

Thanks! I'll try it later today.

 

[Chopito]

Your method was very easy to follow and saving the game worked as expected.

Regarding the RTC, I guess that I had a misconception about it: I thought that you could exit the game, come back the next day, and have the clock be on time; however, from what I've been reading, I think it is flat out impossible to have a GBA game synchronize with the 3DS clock. Other than that, the in-game time does progress as you play.

And for anyone else following this guide, on step #2 I had to delete "output-" from the file name that is autogenerated. This way when you do step #3 you don't have to select a new file to apply the IPS patch.

Thanks again, Maxwellp!

 

[YOHWEHX987]

I just wanted to make a quick guide on how I think EEPROMV122 games can be fixed from not saving on the newly released Open_Agb_Firm for 3DS. It took lots of testing and frustration so hopefully someone will find this for themselves and implement it in an easier way.

A dumped Boktai rom needs altered in 3 ways: SRAM patch, IPS patch, and SRAM Hex edit. The downloaded tools needed for this are GBA Tools Advance(gbata), a sunlight IPS patch (there are several), and any free hex editor(I use HxD.) Of course you'll need the open_agb_firm installed on your 3ds too.

1. Open gbata.exe and select your boktai file.

View attachment 299498

2. Select the SRAM Patcher tab and save location/filename. Patch the rom.

View attachment 299500

3. Select IPS Patcher tab and use your sunlight patch.

4. With your fully patched rom, open it in a Hex Editor and search for 'EEPROM_V122'

View attachment 299501

5. Replace the values as shown and save the file.

View attachment 299502

6. Drop the completed ROM on your SD card and test running from Open_AGB_Firm. It should default to using the default mode 14 (sram 256k) to save.

I've tested this playing off and on for over an hour with no save issues so far. Sunlight and plant growth works as well. I've also done the same with Yoshis Island with success.

View attachment 299503

What about Boktai 2 & Boktai 3? saving still not working for me,I tried gbata & lunar ips but nothing works, could you guide me how to patch or change the save file type or to make it enable save.

Post automatically merged: Feb 22, 2024

 

[Maxwellp]

What about Boktai 2 & Boktai 3? saving still not working for me,I tried gbata & lunar ips but nothing works, could you guide me how to patch or change the save file type or to make it enable save.

Post automatically merged: Feb 22, 2024

I don't know why it would be any different. Were you able to do the whole process for boktai 1 successfully?

 

[YOHWEHX987]

I don't know why it would be any different. Were you able to do the whole process for boktai 1 successfully?

ITS OKAY NOW I CHANGE EEPROMV124 TO SRAM