Reset/Factory settings - is it what you call "flash"?

Hi to all of you!
I'm new to this so please don't be harsh...:a014
My K750i (OK stop laughing, i know its old!) which i kept unused for 4 years, since i turned it on again it goes like crazy...
I cant use the keyboard to make factory settings because it doesn't respond, whenever i press a number the phone does otherwise,crazy stuf!
So i have to use my PC to reset it (i know there's little chance to fix it, but i'll try).
That's what you call flash, right?
So i started by downloading the SEMC_USB_Driver & the SeTool 2 Lite 1.11.
Please tell me before i go on whether i need another tool?
A very thanks to you all!

Try wotanserver :)

FREE Sony Ericsson K750 Firmware Flashing and Debranding. | WotanServer.com

OK thanks a lot!
1)first of all, pressing c+usb+phone turned off don't work to my phone, in either way, SeTool 2 Lite or WotanClient.
The usb drives only detects my phone when i turn it on.

2) SeTool 2 Lite log wrote:

ChipID:8040,EMP protocol:0301

OBSOLETE EROM,FORCING COLOR -> RED
OBSOLETE EROM,FORCING CID -> 49

PHONE IS RED RETAIL PRODUCT
FLASH CID detected:49
Speed:921600
OTP LOCKED:1 CID:36 PAF:1 IMEI:************ CERT:RED
DCU60 flashing only supported for RED CID49 phones !
Elapsed:15 secs.

does that means flash went OK?

3) WotanClient log wrote:Not enough credits! (0 credits)
FAILED invalid account

How come it asked for credits since it's for free?

Did you setup an account?

yeap! Of course i did mate!
I can login WotanServer site just fine with my username.

Then input you account details in the wotan application.

I can't even reconnect the phone, no phone usb is detected now...
I even uninstalled everything and reinstalled it, but when i plug the usb, the connection wizard does not apear.
What's wrong with it?

What can i do with my pc usb ?
I tried with all kind of drivers.
Phone is not connected either way...