It would help if you described what you did and what error you got.
The procedure is pretty straightforward :
To dump Nintendo Switch Online (NSO) emulator application and extract the game ROMs, you will need the homebrew application NXDumpTool (https://github.com/DarkMatterCore/nxdumptool)
Description from my AI overlord :
Ensure you have the latest NXDumpTool .nro file installed on your SD card. You will also need your console's prod.keys generated by Lockpick_RCM.
Boot your Switch into OFW and launch all NSO apps you wish to dump at least once. This ensures they are fully unlocked and successfully decrypted. If you are using the emummc and were using the nro apps already, then skip this step.
If you never used the nro on the emummc, you need to go to the OFW, run the nso and make a new emummc.
Don't connect your CFW to any Nintendo servers are this will likely get your OFW banned.
Launch the CFW and open NXDumpTool via the Homebrew Launcher.
Locate the NSO Titles: In the main menu, select "User Titles" and choose the NSO app you want to rip.
Dump the RomFS: Navigate to NCA / FS dump options > Dump Update (Program #0) > FS Selection (RomFS) and select "Start NCA FS section dump".
Locate Your Files: Remove your MicroSD card, insert it into your computer, and locate the dumped files in the sd:/atmosphere/contents/[GAMEID]/romfs/titles folder.
Sony made a shocking announcement today, revealing that the company plans to move away from physical game releases in the future. Citing claims of how the industry is...
Last month we got confirmation of a new model of Switch 2 to better comply with upcoming EU regulations. With the legislation set to come into effect in February of...
The end has come for the PlayStation 3 and the PlayStation Vita. After supporting the PSN Store on the PS3 and PS Vita since 2006 and 2011 respectively, Sony has...
Tired of waiting for Game Freak to bring Pokemon Emerald to modern platforms? We've got you covered with a brand new port in the works. Currently available on GitHub...
For fans of Sinnoh, the pickings are slim. If you want the best experience you're left deciding between the updated region in Platinum, or the somewhat controversial...
Ocarina of Time is back in style as the upcoming Switch 2 remake looms on the horizon. But what's a fan of the game to do over the next few months? If you've been...
The Switch 2 has been out for a year now, but you shouldn't count the original system out yet! Released a few days ago, popular PS2 emulator NetherSX2 has found its...
The Pokemon series is known for its vast assortment of spin off titles, with the majority being well-received. We've had an assortment of Mystery Dungeon titles, a...
Saber Interactive, in collaboration with Universal Products & Experiences, revealed a new gameplay trailer for Turok: Origins. This new entry to the dino-hunting...
Hot on the heels of their NetherSX2 port, @Nagaa is back with another hugely anticipated release: a Switch port of the popular Wii U emulator Cemu. We've got more...
Sony made a shocking announcement today, revealing that the company plans to move away from physical game releases in the future. Citing claims of how the industry is...
Last month we got confirmation of a new model of Switch 2 to better comply with upcoming EU regulations. With the legislation set to come into effect in February of...
The end has come for the PlayStation 3 and the PlayStation Vita. After supporting the PSN Store on the PS3 and PS Vita since 2006 and 2011 respectively, Sony has...
Ocarina of Time is back in style as the upcoming Switch 2 remake looms on the horizon. But what's a fan of the game to do over the next few months? If you've been...
Tired of waiting for Game Freak to bring Pokemon Emerald to modern platforms? We've got you covered with a brand new port in the works. Currently available on GitHub...
Amidst news of layoffs and cancellations in the wake of Xbox's larger changes, Bethesda has today come out with a statement discussing their active projects. In this...
For fans of Sinnoh, the pickings are slim. If you want the best experience you're left deciding between the updated region in Platinum, or the somewhat controversial...
Announced today during the Octopath Traveler 8th Anniversary live stream, it's been confirmed that both the first game and its sequel will be launching on the Switch...
In this time of everything costing more a year after it's released, it's nice to see some things sticking to the old ways. Capcom have today announced that the latest...
Saber Interactive, in collaboration with Universal Products & Experiences, revealed a new gameplay trailer for Turok: Origins. This new entry to the dino-hunting...