Is there a firmware update for the canon XSi?

1.1.0 and this site from Canon, you can download the firmware.
Canon EOS REBEL XSi 450D Firmware Download
Only when you have a new lens, not yet supported by your came, I would get the firmware.

Yes. That will reset it to it's factory settings.

Not a good idea to post your phone # and e-address on this or any other site.

This question arrived on FixYa.

Problem is the camera firmware isn't compatible with the software possible needs a Canon free update or purchase a card reader and download your pictures stepping around the camera.

The computer will look at this card reader with the memory card installed as an external hard drive or memory device.

Download you pictures and then do a safely eject or eject before removing the memory card, once back in the camera remember to format the memory card this give the camera a nice clean surface to work with again.

Error 99 is Canon's depository for electrical connection problems and a host of other electrical orientated issues. Take a new pencil eraser and gently clean the contacts on the lens (gold) more a polish then a scrub and also do the same with the electric connections on the camera body again more a polish then a scrub. Make sure that no eraser dust has entered the camera body and if so clean it out by using a puffer with the camera lens mount facing downward, that way the partials will fall out not in. Also while you have the eraser handy clean both the contacts on your battery and inside the battery compartment. Another thing is to download your pictures from the memory card onto your computer and format the memory card in the camera. If all that fails then go to the Canon web site and download the updates to your camera's firmware.

What I full expect though is that the camera body to lens connections have become dirty and just need a little attention.

Hope this works for you

Update the cameras firmware.

Go to this page and follow the instructions

http://web.canon.jp/imaging/eosd/firm-e/eosdigital4/firmware.html

One of the easiest ways to corrupt a camera is to download pics to your computer via USB connection, then disconnect without using the "safely remove hardware" function. Also, when downloading firmware updates, if you do not follow the procedure instructions to the "enth" degree, you can actually end up with a "dead" camera.

I think flash pcb or main pcb gone dead so its require to change. Take it to canon service centre.

What exactly is the problem? I smell something fishy with the firmware update procedure.

Update to the latest version (3.8) of DPP (Digital Photo Professional). The update is available on Canon's website.
In this latest version, the trimming tool now also provides angle adjustment.

I can help you fix the BUSY Error or Error 99 of your Canon EOS Rebel XS / Canon EOS 1000D.

Installation of this Canon EOS Rebel XS / Canon EOS 1000D firmware version 1.06 update will solve these problems:

1. Some cameras may exhibit a phenomenon in which the LCD monitor does not display, the shutter does not release, and the BUSY indication remains lit in the viewfinder.
2. The message, "Err 99 Shooting is not possible. Turn the power switch to<OFF> and <ON> again or re-install the battery", appears on the camera's LCD monitor, and after the above operation is carried out,the LCD monitor displays in a language that is different from the actual language setting.

See the firmware instructions and download the firmware upgrade by following these Fixya Tips :

1. Follow this link to download a pdf version of the firmware installation instruction guide.
2. Follow this link to download the Windows Version of the Canon EOS Rebel XS / Canon EOS 1000D firmware version 1.06 update.
3. Follow this link to download the MAC version of the Canon EOS Rebel XS / Canon EOS 1000D firmware version 1.06 update.
4. Follow this link to download the Canon EOS Rebel XS / Canon EOS 1000D Instruction Manual.

I hope that helps.