the file has many zlib chunks one 7z chunk several pngs etc
PNG
:\>grep -obUaP "\x89PNG|IEND" foo.img
1737436:%PNG 1738231:IEND
1740163:%PNG 1744626:IEND
1791365:%PNG 1806922:IEND
1807844:%PNG 1811066:IEND
1813932:%PNG 1829489:IEND
1830411:%PNG 1833633:IEND
7z
:\>grep -obUaP "7z\xbc\xaf\x27\x1c" foo.img
1833641:7z¼_'∟
zlib (there may be false positives here but i arbitrarily python zlib.decompressed one chunk and it decompressed without error
:\>grep -obUaP "\x78\xda" foo.img |wc -l
23
:\>grep -obUaP "\x78\x9c" foo.img |wc -l
16
ripped this chunk and zlib decompressed it
:\>xxd -s 0x1b2183 -l 16 -g 1 foo.img
001b2183: 78 da bd 58 dd 6f a3 38 10 7f ee 49 f7 3f cc f2 x..X.o.8...I.?..
:\>xxd -s 0x1b25dc -l 16 -g 1 foo.img
001b25dc: 78 da ed 3d 6b 73 1c b5 b2 9f 97 2a fe 83 58 72 x..=ks.....*..Xr
:\>xxd -l 16 onechunk.bin
00000000: 78da bd58 dd6f a338 107f ee49 f73f ccf2 x..X.o.8...I.?..
:\>wc -c onechunk.bin
1113 onechunk.bin
:\>cat deczli.py
import zlib
print(zlib.decompress(open("onechunk.bin","rb").read()))
:\>deczli.py
result
b'<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">\r\n<html>\r\n\t<head>\r\n\t\t<meta http-equiv="cache-control" content="no-cache">\r\n\t\t<meta http-equiv="pragma" content="no-cache">\r\n\t</head>\r\n\r\n\t<body>\r\n<!-----\t\t<h3 id="spotify">Spotify Information</h3>\r\n\t\t<div class="new_line">\r\n\t\t\t<div id="status_username" class="line_title">Spotify username:</div>\r\n\t\t\t<div class="line_value netRemote_spotify_username">
XXXXXXXXXXXXXXXXXXXXXXXX
<div class="line_value netRemote_sys_net_ipConfig_dnsPrimary"></div>\r\n\t\t</div>\r\n\t\t<div class="new_line">\r\n\t\t\t<div id="status_dns_address_secondary" class="line_title">Secondary DNS Address:</div>\r\n\t\t\t<div class="line_value netRemote_sys_net_ipConfig_dnsSecondary"></div>\r\n\t\t</div>\r\n\t\t<div class="page_button">\r\n\t\t\t<input id="status_refresh" type="submit" value="Refresh" />\r\n\t\t</div>\r\n\t</body>\r\n</html>\r\n'