I want to repair this flash memory keeping the data to recover

Dear friends,
Please I need your help in repairing this flash memory keeping the data to recover.

Description: [G:] USB Mass Storage Device (USB 3.0 NAND Flash)
Device Type: Mass Storage Device

Protocol Version: USB 2.10 <- Hint: This device can run faster when plugged to a USB 3.0 port
Current Speed: High Speed
Max Current: 200 mA

USB Device ID: VID = 1F75 PID = 0917
Serial Number: F12340000063000424256863

Device Vendor: Xr5e`r_J_e_
Device Revision: 0001

Manufacturer: USB 3.0
Product Model: NAND Flash

Product Revision: 1.00

Controller Vendor: Innostor
Controller Part-Number: IS917-E0 - ??ROM??
AI: Could you please describe the specific problem or error you are encountering with the flash memory?
I can't open or format my flash memory; I just see the drive letter.
AI: What is the brand and model of the flash memory device you are trying to repair?
NAND Flash

First you need to backup this memory sector by bsector for example with dd program... It provide some functions to recover files from damaged memory.

>>21516216 Can you provide me with good software to back it up? I used EaseUS Recovery but can't see it. If you have a download link for a suitable one.