My son has updated his iRiver H10 but did not have your problem ~ his suggestion (when I mentioned your Q to him) was "why don't you just recreate the photo folder then?".
Sorry, I know nuthing about the iRiver ~ I just bought it for him.
What is ransomware and how do I protect my PC from WannaCry?
What I learned from my mentor, Oscar-winning VFX supervisor Phil Tippett
Siri vs Google Assistant
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.