enable-spotify-devtools.py

# Created by @PhilippIRL
# This script patches Spotify's offline.bnk file (this file caches the remote config) to trick Spotify into thinking that your account is enabled for dev tools.
# Spotify will automatically revert this local change after some time when it next fetches the remote config.
# Of course you will have to completely close Spotify before running this script.

import os, sys, platform

systemPlatform = platform.system()

if systemPlatform == 'Windows':
    filePath = os.environ['LOCALAPPDATA'] + '\\Spotify\\offline.bnk'

elif systemPlatform == 'Darwin':
    filePath = os.environ['HOME'] + '/Library/Application Support/Spotify/PersistentCache/offline.bnk'

elif systemPlatform == 'Linux':
    homePath = os.environ['HOME']
    
    snapSpotifyHome = os.environ['HOME'] + '/snap/spotify/common'
    if os.path.exists(snapSpotifyHome):
        homePath = snapSpotifyHome

    filePath = homePath + '/.cache/spotify/offline.bnk'

else:
    print('Sorry, your platform is not yet supported.')
    sys.exit(1)

# check if spotify is installed
if not os.path.exists(filePath):
    print('It seems like you don\'t have Spotify installed.')
    sys.exit(1)

file = open(filePath, 'r+b')
content = file.read()

# find last occurence of string 'app-developer'
loc = content.rindex(b'app-developer')

# 15 bytes after this string is the location we want to patch
patchLoc = loc + 15

# only patch if the value is what we expect
if not (content[patchLoc] == 48 or content[patchLoc] == 50):
    print('Unexpected value', content[patchLoc])
    sys.exit(1)

file.seek(patchLoc)

# change one byte to 50 (ascii '2')
file.write(bytes([50]))

file.close()

Spotify seems to overwrite my offline.bnk file every time I restart the app.

This is expected behavior and mentioned on line #3.

Furthermore, when I run this script, I get the error ('Unexpected value', '0') — but wouldn't the expected value be 0?

This may be due to using python 2.x instead of python3. If you have both on your system, try specifying python3 when running the script, python3 enable-spotify-devtools.py.

Just posted a bash version of this script for Linux/macOS users - jetfir3/tmpdevmodify.sh

Script is a bit more "forgiving" on the Linux side as some distros or install methods (such as flatpak) have paths which may differ. Also includes an option to wipe app cache if mistakes are made using dev tools.