I believe I have the exact same card as you. See my pics below to confirm, if you like.

I've never used NVFlash before. I am pretty sure I did everything right, but I just felt you should be aware.

Hopefully this works for you.

And in case you care, here's a read out of my card's BIOS when I use the "--version" flag in NVFlash.

1NVIDIA Firmware Update Utility (Version 5.40)
2
3Adapter: GeForce4 Ti 4200 with AGP8X (10DE,0281,1043,807B) H:N B:01,AGP,D:00,F:00
4The display may go *BLANK* on and off for up to 10 seconds during access to
5the EEPROM depending on your display adapter and output device.
6
7Reading adapter firmware image...
8Image Size            : 58368 bytes
9Version               : 04.28.20.05.00
10~CRC32                : D8B2A44E
11OEM String            : NVidia
12Vendor Name           : NVidia Corporation
13Product Name          : NV28 Board
14Product Revision      : Chip Rev A0
15Device Name           : GeForce4 Ti 4200 with AGP8X
16Vendor ID             : 10DE
17Device ID             : 0281
18Subsystem Vendor ID   : 1043
19Subsystem ID          : 807B
20Hierarchy ID          : None
21Sign-On Message       : ASUS V9280/TD/N/128M VGA BIOS Version 4.28.20.05.AS19

Thank you kindly ! Unfortunately im unable to do anything with nvflash for dos as it throw me eeprom id unknown all time and refuse to do any manipulations.I will try update from windows .

Hmmm, I wonder if the EEPROM is bad, or maybe there's damage to a connected component or trace. There's a YouTuber called vswitchzero who did some work replacing damaged EEPROM chips from some Voodoo 3 cards if I remember correctly. That might not be a bad place to check for ideas on what to do next.

You might also just want to try checking the card with a different version of NVFlash. I needed to try a couple before I found one that wouldn't crash on me, so maybe the software can be a little finnicky. Or maybe try in another motherboard if you have one.

Yeah seems like it won't be lazy repair , I have tried 5 or six versions of nvflah starting from ver. 5.13 . I definitely will try it on another board . Also will try update in windows.