Hey, thanks for checking out Picoware!
Picoware’s uf2loader overwrites the entire flash, including the section used by pelrun’s.
If you wish to keep his then you’ll need to download Picoware’s uf2 and move it to your SD card. You can actually do that within Picoware if you go to Library → System → Check for Updates, and let it install the update. Then once the installation is complete you can hit Back/Esc to skip flashing.
The updater saves the uf2 to pelrun’s uf2loader’s expected location.
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Downloaded to SD card and it will not load. Picocalc turns on but screen is blank.
Used to download but I need the picoware uf2 for the pico 2w. Any help appreciated. Thanks
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Got it figured out. Thanks for the videos. The PicoCalc is now running 1.8.6 without any problems. Thank you for all of your work.
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NEW Picoware update v1.8.7 
This is an update to the MicroPython version that fixes system settings saving, addresses Cardputer ADV threading and memory issues, updates Ghouls to the latest version, and adds miscellaneous updates to the Simulator, the HTTP class, the LCD class, and apps!
Check out the full release notes here: