Research in Motion's Yahoo! Messenger client (located at
http://www.blackberry.com/go/yahoo) requires a specific Y!M service book to be able to function on any given handset. Now, as I'm sure some of you are well-aware, AT&T sadly does and will not currently provision the Y!M service book ("
BBFS2[YHO]") when downloading/installing Y!M. However, other service providers will, and I have taken the liberty of separating into a Backup/Restore file the service book for Y!M into a nice, easy Backup/Restore File, which can be loaded up right into the device via the Desktop Manager Backup/Restore (I'm sorry, no desktop solutions for Mac users yet, but stay tuned!). Just make sure that you remember that this is going to delete all your current service books, so you'll need to manually register via the Host Routing Table editor in
Settings/Options >
Advanced Options to get your books back. Also, you'll need to log into your BIS account and resend the service books from there, as well as regenerate any encryption keys if you're using the Desktop Redirector or are on a BES (don't forget to have your friendly neighborhood BES administrator create an IT policy enabling Y!M traffic, too).
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Now, another way this can be done involves inserting another GSM carrier SIM card (such as T-Mobile, for example) and downloading/installing Y!M from
http://www.blackberry.com/go/yahoo from there. At that point, you should check your service books and make sure that you've got "BBFS2 [YHO]" listed, then switch back the SIM card to your AT&T SIM (your handset must be unlocked to proceed, though).
Basically, there are just a few steps to go through here:
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#1: Download the .ipd backup file for your appropriate handheld software version here (check
Settings > Options > About if you're unsure):
OS 4.0.x:
http://www.boomspeed.com/setzer/Blac...k_OS_4.0.x.ipd
OS 4.1.x and 4.2.x:
http://www.boomspeed.com/setzer/Blac...nd_4.2.x.ip d
*Now, for Y!M 2.0! (Special thanks to the amazing
Ophidian):
BlackBerryForums.com : Your Number One BlackBerry Community
*Note: the .ipd file provided by Ophidian actually contains the service books for all of RIM's IM clients. However, it appears that only Y!M and Google Talk will work if you're using AT&T Mobility, but some of you folks on other wireless carriers may have better fortune.*
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#2: Restore the file to your handset using Desktop Manager (see
https://cingular.atgnow.com/cng/tutorials/KB4717.html for instructions).
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#3: Manually register your handset with the RIM network via the HRT editor (see
https://cingular.atgnow.com/cng/tutorials/KB49643.html for instructions).
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#4: Log into your BIS account and re-send BIS service books:
BIS 1.8 (from PC) -
https://cingular.atgnow.com/cng/tutorials/KB2355.html
BIS 2.3 (from PC) -
https://cingular.atgnow.com/cng/tutorials/KB64052.html
BIS 2.3 (from handset) -
https://cingular.atgnow.com/cng/tutorials/KB64276.html
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#5: If applicable,
regenerate encryption keys for Desktop Manager or BES. If you're on a BES, again, make sure your BES administrator can create a policy allowing Y!M traffic.
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#6: One more thing: if you find that the service does not work right from the install, try doing a hard reset (pulling/reinserting battery).
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I've noticed that some users are having issues restoring the service books to their handset, stating that they "cannot restore read-only databases." This issue has been researched and is addressed in the following article: BlackBerry Technical Knowledge Center Article: KB-04461. Check that out for further information.
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I know it's not very organized, but I hope you all find this useful. Good luck, and happy messaging. =)