Fresh firmware install - lost hidden gallery items

[AC Question]

Hi Experts,

So this happened with me:

- Tried rooting my Android - Successful
- Installed Root Booster App - Successful
- Enabled Speed booster from the app - successful

- Phone Bricked after restart :X

It was in a boot loop. Just stuck there. So went to recovery mode and wiped cache and did a factory reset. Did not work. Still stuck in boot loop. After a deep thought, I decided to install a fresh firmware.

Specs:
- My Device: Samsung Galaxy Note 3 Neo
- Model Num: SM-N750
- Firmware: N750XXUDPA2
- ANDROID: 5.1.1 (lolipop)

I did a fresh install of the firmware using the right tools and was able to get back my phone.

Problem:
Earlier, I got all gallery items stored in the SDCARD. I hid a few important items from general view by making a folder and adding all images in it, then made the folder hidden. Since I removed the SDCARD before formatting or installing the firmware, it was out all times. No chance of data lost.

However, when I try to access the same gallery now, it only shows the gallery items which were not hidden. I am not able to locate any of the hidden folders and images.

Since the images are very important, I hope you experts can help me out and point me in the right direction on how to restore them.

Please help!

Thanks!
Jas