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Users, in droves, continue to report a bevy of issues after the update
to iPhone OS 2.2. Among the most serious and widespread problems:
disappearing applications (both Apple’s and third-party), loss of WiFi
connectivity, loss of 3G or EDGE signal strength and an inability to
sync with iTunes.

Downgrading to iPhone OS 2.1 If you are experiencing intolerable
issues after the update to iPhone OS 2.2 and would like to attempt a
downgrade to iPhone OS 2.1, you can try the following procedure. Note,
however, that they procedure may not work, and you may be forced to
restore your iPhone with OS 2.2, potentially losing data in the
process.

1. Download iPhone OS 2.1 IPSW: [iPhone (first generation) | iPhone 3G]
2. Turn off your iPhone by holding down the sleep/wake button.
3. After the phone is off and hold the sleep/wake and home buttons at the same time for 10 seconds.
4. Release the sleep/wake button; continue to hold down the home
   button until iTunes detects the iPhone in “recovery mode.” Your iPhone
   is now in DFU mode.
5. Hold down the option key on a Mac or alt key on a PC and click “Restore” in iTunes.
6. Locate the IPSW file and select it.

Disappearing apps (cont.) Dozens if not hundreds of users have
now reported a problem in which various iPhone applications, both
third-party and included, disappear after the update to iPhone OS 2.2.
In some cases, the afflicted iPhones were jailbroken, in others, they
were not.

A sampling of reports from iPhone Atlas readers:

• “When I upgraded, all my apps non-original apps disappears, except
  for google! When I tried to re-download and then resync them onto my
  iphone, only some of them would appear. After talking to support, we
  tried starting my computer (she said this was happening to some people)
  and then syncing. This added a couple more, but about 10 were still
  sitting in my itunes and refusing to sync.”
• “After the os 2.2 update. Safari suddenly disappeared. Syncing etc
  didn’t work or resolve the issue. I had to do a restore to get things
  back to normal.”
• “After upgrading to 2.2 the iphone camera app disappeared, and
  every program that uses the camera stopped working also. Restoring the
  phone brought it back but then the next Sync made it go away again.
  Very annoying. How much QA did they do before they released this
  upgrade? I can understand third party apps breaking but not the base
  applications.”
• “I also have had a problem with a missing application. My camera
  application has disappeared and I tried restoring it, and it appeared
  for about five minutes, let me take one picture, then was suddenly gone
  again.”

Possible fix: Setup as a new phone Try setting your iPhone up as
a new phone then re-downloading an missing applications. To do this,
perform a restore in iTunes, then choose “setup as a new phone.”

WiFi cannot connect (cont.) Perhaps the most widely reported
problem after disappearing applications is one in which WiFi
connectivity fails after the iPhone OS 2.2 update.

Reports from readers:

• “Slowly updated my iPod Touch to 2.2 and now wifi does not connect.
  Get the check mark but no ip address is assigned. Tried renewing and
  rebooting. This is a step backwards.
• “I cannot connect to my wifi at home and I never had a problem in the past.”

In some cases, “forgetting” the currently configured network and then
reconfiguring it can resolve the issue. Other potential fixes include:

• Switch the router to WPA2
• Remove all spaces from the WPA pass phrase
• Remove all security from the router until a stable connection is attained then reconfigure the security

Cannot sync with iTunes Several users have reported an issue in which they are unable to sync with iTunes after the iPhone OS 2.2 update.

One reader writes:

After the update to OS 2.2, iTunes is unable to completely connect
to iPhone. iTunes message says I must restore iPhone to original
settings. iTunes shows iPhone on side menu, but only partially. And I
have no access to its contents. (For example, iTunes is unable to say
the memo usage, or even the iPhone’s name. It just shows ‘iPhone’ and
nothing more, instead of ‘Andre’s iPhone’ and 2 GB used memo.”

There are a number of potential fixes for this issue. Among the most commonly successful:

• Reinstall iTunes 7.6.1 (Mac/Windows) Simply download the package, run the installer and restart.
• Check the USB port Make sure that your iPhone is connected
  to a normally powered USB 2.0 port. If you’re using a hub, try
  connecting the iPhone directly to the computer or vice versa. Also try
  switching ports.
• Turn off auto-lock On your iPhone, tap Settings > General > Auto-Lock and set it to “Never” then re-attempt syncing.
• Restore the iPhone Click the Restore button under the
  Summary tab. Restoring the phone will erase contacts, calendars, photos
  and other data on the phone (including any third-party applications),
  but will restore automatically backed-up information including text
  messages, notes, call history, contact favorites, sound settings,
  widget settings, etc. Some users have reported that restoring the
  iPhone, but not restoring custom settings data from the computer-stored
  backup alleviates this issue. Note that you’ll lose text messages,
  notes, call history, contact favorites, sound settings, widget
  settings, etc with this method, though you can restore them anytime by
  simply doing another restore and choosing to push the backup to the
  phone.
• Play the isolation game Leave your iPhone connected (or plug
  it in if it is not already connected). Deselect all sync options. This
  requires going to the Info, Ringtones, Music, Photos, Podcasts and
  Video tabs and unchecking every box. Sync your iPhone. Note that this
  may result in deletion of some data from the iPhone. Re-attempt a sync
  with all of your normal options. If it fails, try checking only one or
  two sync options and repeat the process until you find the problematic
  sync data.