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Update is non-reversible

If you use Zune or Cab-sender to update to Windows Phone 7.8 (when it becomes available), the process is non-reversible. This means that you can't use your Zune backup to restore to a version from before the update to Windows Phone 7.8. If more updates will follow, you will be able to restore to earlier versions from Windows Phone 7.8. But still not to versions earlier than that. Microsoft has decided to flag the Windows Phone 7.8 update as "not possible to restore to earlier build anymore".

In most cases, it will still be possible to do a full flash with an older stock ROM image. But that means you loose unlocks and app-data.

If you updated to Windows Phone 7.8, using Zune, and then try to restore a backup, you will get error 801812E0. Microsoft provides this information and they insure you that your device is okay, even though you get the error code.

I'm not sure why Microsoft decided to do this, but I guess this is meant to be some anti-piracy-measure.

Unlocks

If you unlocked your device using "alternative methods", I advise you to wait until the Cabs are available to use with Cab-sender and then take some precautions before updating, because reverting might not be an option. I have not actually tested this for the Windows Phone 7.8 update, but I will try to get confirmation as soon as possible.

Steps:

  • Download the necessay Cab files.
  • Make sure you have WP7 Root Tools fully installed on your phone.
  • Put your phone in Airplane mode and don't enable internet until all steps are done.
  • On PC go to %systemroot%/system32/drivers/etc and open the hosts file in a text editor and add this line:
    127.0.0.1 developerservices.windowsphone.com
  • Install the CAB files using Cab-sender.
  • Your phone should still be unlocked now. Open WP7 Root Tools, go to the Tweaks tab, and enable "Prevent relock".
  • Now you can disable Airplane mode.

I hope this will help you with the update. But remember: this method is not yet confirmed for the Windows Phone 7.8 update!

- Heathcliff74 -

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I own a DELL Inspiron laptop. I carry it around a lot. I'm always really careful with my laptop and all accessories. But despite the fact that I am really careful with my hardware, over time I've spent a small fortune on it. Not on components in the laptop, but on DC POWER ADAPTERS! I don't remember how much I had of them, but I think there were 6! 1 of them died from a blow-up. All others are rendered useless, because of the signal-cables from the adapter to the laptop have broken. I want to stress again, that I am really careful with my stuff! I've know about this weakness for a long time, and for that reason alone I always make sure the adapter cables are never bent or stretched too much. Also when putting the adapter in the case, I also roll the cable very carefully.

But despite this very careful usage, the adapters keep on getting broken! The cable from the adapter actually has 3 wires: V+, GND and 1 wire for a data-signal. In the laptop and in the adapter are chip's that do a handshake when the connection is made. In the handshake the adapter tells its capabilities to the laptop. This a sort of safety measure that you don't accidentally use an adapter with not enough power and then "blow up" the adapter.

But the problem is this: the long wire between the adapter and the laptop is totally NOT suitable for this data-signal. After using the adapter for a while the quality of the wire decreases. While the wires are still perfectly capable of transmitting the power from the adapter to the laptop, the wire for the data is not capable of sending it's ID to the laptop. I still have about 3 adapters laying around here that have good power, but bad ID-signal and therefore useless. The circuit that should prevent the adapter from dieing, is in fact the weakest link and the first reason for the adapter to die!

This is in fact a lousy construction, but the worst is yet to come. When the problem arises, this is the error message you get: "The AC power adapter type cannot be determined. Your system will operate slower and the battery will not charge. Please connect a Dell 90W AC adapter or higher for best system operation." WHAT!?!? The CPU will run on half speed!!! And there is no way to override that behavior!!

This is terrible! When this happens, that means you cannot use your laptop anymore without adapter, because there is no way to charge your battery anymore. Using the laptop somewhere on the way is not possible anymore! Also the laptop is SLOOOOOWW! WHY, DELL?! WHY?! I know my freakin' adapter is OK! Stop bugging me! Let me do my work!

So, after knowing this problem, and after having bought plenty of adapters (DELL original and also replacement adapters, which all have the same weakness) I thought I'd try something different. I came across this article. This looks promising! It describes how to place the ID-chip from the adapter in the laptop, so it will always recognize the adapter, even universal adapters. So I wanted to try to mod my laptop. First I carefully took out the ID-chip from one of my power-adapters, including the diode and resistor in that circuit.

Then I cut the ID-wire from the DC Power Jack in my laptop and soldered the ID-chip inside the laptop.

Result: Nothing! I did everything very carefully, but obviously I made a mistake somewhere. Or the chip has died somewhere along the process. I don't have digital equipment to measure what's wrong. I ended up restoring the cut fire from DC Power Jack and all is back how it was. Adapters are still not being recognized. So I have to buy YET ANOTHER adapter to be able to properly use this laptop again.

So, if you are planning on buying a new laptop, and you plan on carrying it around a lot, and you are considering a DELL Inspiron Laptop... then DON'T!! It will be totally frustrating when you can't use your laptop anymore without adapter, or your laptop becomes SLOOOOW. Just buy a brand that has a simple power-adapter, which lives much longer, and can be replaced with a universal adapter.

I am totally convinced that DELL does this to make extra bucks from people who need to buy new adapters over and over again. I will never buy a DELL laptop again.

- Heathcliff74 -

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I uploaded WP7 Root Tools 0.13 beta. You can grab it from the download-section. This version is the first version of WP7 Root Tools that has the beta-tag. I fixed a lot of big and small bugs and I implemented some performance-improvements. So, I hope this version will work stable for everyone. Most important fixes:

  • After install of version 0.12 alpha, some apps wouldn't start anymore - FIXED
  • Root Access installed would report error RA-ARA-01 55 on some devices. Not been able to test this, but i think it is now FIXED
  • Shell handler would not launch correctly sometimes - FIXED
  • Improved Russian, Czech and French translations
  • Name of search provider was not correctly shown sometimes - FIXED
  • Crash when current location of registry or explorer was deleted - FIXED
  • much more...

 - Heathcliff74 -

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HD2Owner has released the ROM packages for Windows Phone 7.8 RTM. So far, this was exclusive for the Dynamics custom ROM series. But now they can be downloaded from this XDA thread.

Package details:

Label=WM7_Main_Ship
ParentBranchBuild=8858
TimeStamp=20121105-2048
Builder=mojobld

I expect a lot of custom ROM's to be released with Windows Phone 7.8 soon.

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Ultrashot is the main-developer behind the Dynamics Custom ROM series for Windows Phone. Recently he has release a new version of his ROM, which is based on Windows Phone 7.8 RTM and his new Full Unlock v4 which has a lot of new features:

  • Native application support.
  • Selective root access for applications alongside with possibility to open full access to system for all applications altogether.
  • Root access usage notifications.
  • Enhanced security.

He has now released Full Unlock v4 as separate package, available for other ROM chiefs. Some other notes:

  • That's a squeezed release - some registry entries were removed to reduce a number of dependencies.
  • Full Unlock v4.0 is available for all, but all the rest from Dynamics 2.0 and derivatives is still prohibited. v1.21 stuff is allowed to use.

You can download the Full Unlock v4 package from this XDA thread.

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