Updated Troubleshooting (markdown)

Troubleshooting.md

@@ -61,7 +61,7 @@ Headphones tells you there is a new version available, but an update fails. The
 
 Or:
 
-Headphones does not start anymore, after an update.
+After an update, Headphones does not start anymore.
 
 _Solutions_:
 
@@ -71,7 +71,7 @@ The auto-update function of Headphones uses [Git](http://en.wikipedia.org/wiki/G
 
 For Synology users it may be necessary to specify the full path to the `git` binary.
 
-*Note:* in some cases, you'll have to cleanup the `*.pyc` files that Python generates automatically. On Linux, this can be done via `find . -name "*.pyc" -exec rm -rf {} \;`, in the root directory.
+*Note:* in some cases, you'll have to cleanup the `*.pyc` files that Python generates. These files are byte-compiled source files. Since v0.5.1, a script is included in `contrib/clean_pyc.sh` to clean these files for you.
 
 ### Manual update ###
 Use the following commands to _reset_ your repository. Backup your configuration and database files, just in case.
@@ -104,6 +104,8 @@ Sometimes, you just want to go back to an older version. For instance, there is
   * Pick a commit hash (long string of letters and digits)
 * `git reset --hard PUT_HASH_HERE` — this WILL overwrite all local changes! It will spare your config and database.
 
+Alternatively, since v0.5.1, you can run `contrib/downgrade.sh <path to data folder>`. This should restore Headphones to the last version that started successfully. You need to have Git installed, and it's Unix-only.
+
 ## SSL-enabled servers/indexers/search providers don't work ##
 _Symptoms:_