Cheap flasher

[erogsm]

Hi *,
I made yourself chineese flasher from www.id2.cz and always when I tried running the flasher get information
"After start TX remain HIGH".
I used chip 16876SP4 because don't have SP20, and oscilator 4MHz.
I tried on different pc and always the same message.
I think that something is wrong in cable, but don't know what ?
I saw on this forum with search and can't found solution.
Please could someone tell me what can I check.
Is it possible that FIA are old, don't think so but asking?
Thanks to all who give me solution!

Regards to all

[erogsm]

Sorry I forgot to tell you that on connector in cable for 3510 I have only 4 PINs.
MBUS, GND, RX, TX is it enough?, or need Vpp (above-right)

[NSerN]

Not enough.
You mast use also: Vpp, BSI, Btemp and +4V. It's need to put phone in local or test mode.

[erogsm]

Thanks a lot friend ,
that means I must connect BSI direct to GND on 3510, or....
Please NSerN could you give me little more explanation.
I built your self cheap flasher, with 16F876SP04, with OSC4MHz,
When I started program it found correctly version1.01 build132.
That is correct. I used correct 3510 4.24 MCU +PPM and click on Flash button. Even If phone is not connected I get on program bottom, at first "Turn On mobile" and after Entering Test mode and on screen "After starting TX remains HIGH", but mobile is not connected.
That means something wrong in cable. I checked on 3 different PC but always the same.
Also saw on this forum to much "After starting TX remains LOW", but I have HIGH, are there something different.
Please send me more information if someone have hardware expiriance.
Thanks a lot to all, excpecialy to NserN, who answered on my question
Regards

[Saulyss]

at first use 20 mhz pic instead of 4 ........ that's suggestion