# Project doesn't load

**URL:** <https://forum.makecode.com/t/project-doesnt-load/11240>\
**Category:** Help\
**Created:** [December 6, 2021, 5:47pm UTC](https://forum.makecode.com/t/project-doesnt-load/11240 "2021-12-06T17:47:30Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![ThePyroMan8](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.makecode.com/thepyroman8/32/5454_2.png) [@ThePyroMan8](https://forum.makecode.com/u/ThePyroMan8)\
**Post date:** [December 6, 2021, 5:47pm UTC](https://forum.makecode.com/t/project-doesnt-load/11240/1 "2021-12-06T17:47:30Z")

</div>

Okay so I was making a small game and things were going well up until yesterday. I tried to add some new blocks of code but the simulator didn’t update. Later on, after I closed and opened the website, all of my assets just stopped existing for some reason and the game couldn’t run obviously. Now, a day later, I check to see if it was just a momentary thing but it just got worse, nothing is here, no blocks no assets like i started anew. Does anyone know what happened and/or how to solve it?  
I have html of the simulator before this happened if that’s important

---

<div class="post-metadata">

**Author:** ![Grimm](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.makecode.com/grimm/32/5507_2.png) [@Grimm](https://forum.makecode.com/u/Grimm)\
**Post date:** [December 7, 2021, 5:25pm UTC](https://forum.makecode.com/t/project-doesnt-load/11240/2 "2021-12-07T17:25:32Z")

</div>

If your using Javascript @kwx solved this problem Edit: See UnsignedArduino’s response, simply drag&drop the UF2 file into [arcade.makecode.com](http://arcade.makecode.com/), same as loading a saved image. I’m keeping the unnecessarily complicated method below for curiosity’s sake.

The UF2 file does indeed contain a copy of the source 🙂

There’s likely a cleaner way to do that, but here’s how I got the data out using command line tools.

First confirm that the “source” magic number is present - this part isn’t part of recovering, but I wanted to check if it has source at all:

```auto
$ fgrep -ba 

```

Use the uf2conv tool to get a binary file: [https://github.com/microsoft/uf2/blob/master/utils/uf2conv.md](https://github.com/microsoft/uf2/blob/master/utils/uf2conv.md)

```auto
$./uf2conv.py ~/FILE.uf2 --convert --output FILE.bin

```

Load the file into a binary-clean editor, search for “LZMA”, delete everything up to and including the final `}` of the JSON header, and save to _FILE\_SOURCE.lzma_ . In my case, the first bytes of the compressed data was `]^@^@` or `5d 00 00 80 00` in hex.

Then use the `lzma` and `jq` tools to get the source back:

```auto
$ lzma -d < FILE_SOURCE.lzma > source.json
$ jq '.["main.ts"]' < source.json > recovered-main.ts

```

(The source actually contains an extra JSON header, but the extraction worked anyway.)

It should be possible to wrap this in a recovery tool, but I wanted to save the steps in case this helps someone else, or future me if I get bitten by such a bug again…\x41\x14\x0E\x2F\xB8\x2F\xA2\xBB’ FILE.uf2  
495620:[binary stuff]{“compression”:“LZMA”}

```auto

Use the uf2conv tool to get a binary file: [https://github.com/microsoft/uf2/blob/master/utils/uf2conv.md](https://github.com/microsoft/uf2/blob/master/utils/uf2conv.md)

```

DISCOURSE\_PLACEHOLDER\_2

```auto

Load the file into a binary-clean editor, search for “LZMA”, delete everything up to and including the final `DISCOURSE_PLACEHOLDER_3` of the JSON header, and save to *FILE_SOURCE.lzma* . In my case, the first bytes of the compressed data was `DISCOURSE_PLACEHOLDER_4` or `DISCOURSE_PLACEHOLDER_5` in hex.

Then use the `DISCOURSE_PLACEHOLDER_6` and `DISCOURSE_PLACEHOLDER_7` tools to get the source back:

```

DISCOURSE\_PLACEHOLDER\_8

```auto

(The source actually contains an extra JSON header, but the extraction worked anyway.)

It should be possible to wrap this in a recovery tool, but I wanted to save the steps in case this helps someone else, or future me if I get bitten by such a bug again…
```