Use srch_strings from the sleuthkit and some terminal-fu to find a flag in this disk image: dds1-alpine.flag.img.gz
To solve this all I had to do was grep for "pico" using the command below
cat dds1-alpine.flag.img|strings|grep pico
The command above was able to search for any strings containg "pico" within that file dds1-alpine.flag.img doing so this is what I got in return:
ffffffff81399ccf t pirq_pico_get ffffffff81399cee t pirq_pico_set ffffffff820adb46 t pico_router_probe SAY picoCTF{f0r3ns1c4t0r_n30phyt3_ad5c96c0}
Moreover the flag was the in the last line: picoCTF{f0r3ns1c4t0r_n30phyt3_ad5c96c0}