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How To Check if Your iPhone is Tethered, Unlockable and BootLoader Version with F0recast

For those who are new to iPhone jailbreaking, it is not uncommon you will have the following questions in your mind:

Can my iPhone 3GS be unlocked?

What tool should I use to unlock my iPhone? blacksn0w or ultrasn0w?

What’s the bootloader version of my iPhone?

How can I know if my iPhone is tethered or untethered jailbreak?

With various jailbreaking tools and firmware available, the developers from have come up with a great tool called f0recast that helps answer the above jailbreaking-related questions.

F0recast is a free tool that will check your iPhone and iPod touch to determine whether it is tethered, or unlockable (for iPhone only). The tool also show your iPhone’s serial number, boot loader version and model. If your iPhone is unlockable, F0recast also advises the corresponding unlock tool (e.g. blacksn0w).

The tool only works on Microsoft Windows and requires to have .NET framework 2.0, as well as, iTunes 9.0 (or up) installed. To use the tool, simply launch it and connect your iPhone via USB. The F0recast app instantly shows you the jailbreaking-related info.

If you are unsure which tool you should use for unlock or you want to know the boot loader version for baseband downgrade, go ahead and download F0recast. To download, you can check out F0recast at

About Simon Ng

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6 Responses to How To Check if Your iPhone is Tethered, Unlockable and BootLoader Version with F0recast

  1. Anna July 17, 2010 at 10:23 am #

    Hi Simon,

    I jailbroke my phone and ever since then when I turn off my phone the display screen shows the usb-Itune image. Please advise on what I should do please.

    iPhone Illiterate

    • Simon Ng July 17, 2010 at 9:57 pm #


      I think you haven’t jailbroken your iPhone successfully. What version of iPhone OS are you using? If you’re using iPhone 3.1.3, I suggest you to use Spirit for the jailbreak.

  2. Jeff June 18, 2011 at 5:48 am #

    The forecast show my iphone 4:

    Unlockable?: no

    What can i do now? Please help

  3. reko May 10, 2012 at 5:50 pm #

    Hello Sir,

    I have .netframework 3.5 installed, but I can’t run forecast application… it gave me an error from .network : “unable to load dll” itunesmobiledevice.dll

    if i click continue the application run, but it doesn’t recognize – although I connect my lock iphone 3g to the computer (I don;t know the ios, the firmware, the baseband, modem version, jailbroken or not, etc)

    Itunes runs automatically soon I connect the cable… and “iphone icon” appear under device-list on the left side… but the right side of itunes just blank.

    What did I do wrong ?

    any kind of help will be greatly appreciated.
    Thank you in advanced.

  4. reko May 10, 2012 at 5:52 pm #

    sorry…. forget to tell that I use itunes version 10.5…

    Have tried to downgrade to itunes version 9.2 … still no luck… (itunes 9.2 won’t recognize my iphone when I connect it to the computer).

    Thank you/


  1. Can my iphone 3GS be unlocked using iPad baseband with Ultrasn0w? - January 10, 2012

    […] iPhone BOOTLOADER version for Windows users How To Check if Your iPhone is Tethered, Unlockable and BootLoader Version with F0recast Some are easier than others, but all should be […]

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