This worked for me, my P1i is using the WG1 firmware:

I simply used the update application called SEUS (Sony Ericsson Update Service [Only Registered users can see links . Click Here To Register...]) and loaded the new firmware.

Now I have as follows:
Phone: CXC162037 R9K009
Bluetooth: CXC162143 R1D
Organizer: CXC162108 R6G04
CDA: CDA162022/1 R6G02

Related information:
[Only Registered users can see links . Click Here To Register...]
[Only Registered users can see links . Click Here To Register...]
[Only Registered users can see links . Click Here To Register...]

Improvements:
I do not know, but what I noticed is that now even opening up email boxes is blazing fast. It was a real negative for me, now resolved.

My P1i firmware is CXC 162037 R9H004. When exit some application i get kern-exec 3 error. I want to update the latest firmware but i've never do this before.

Is there any risk when updating?
Can you describe the updating in detail how to do it.

Thanks

Pls cn u post me those tutorials am in a mager prob with my fone.i just copied some files n reboot the fone.bt it appears a very dark screen n li8s on.i think wit updating firmware it'l b k,r8?...

just wondering. with some of the mod/hacks, will they be affected. or if u have used any of the mod/hacks, was there any problem?

oh yea, i already updated. since i never installed any SE pc suite, i had to download the se update manager from the se website.

its not really the actual program, but a downloader, so after u download and execuite it, it will download (for me it was VERY slow) the update program.

after download, it will ask u to follow steps, shutdown/connect mobile, etc. then it continue to... (guest what? yes!) download the *real* update. (yes i know, i wish we could just specify what our phone and just get it over with.. and its also slow..)

then after that hopefully, no error, no crashes, no accidental disconnection, your p1i would be safe and updated.

oh just in case, it will warn you also, make sure to backup first. because it surely wiped out everything. thank goodness i recently did a master reset so i didnt worry much. xD

Dont know bout u,but ever since my phone can send infred...thanks!