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Apple Stops Signing iOS 12.3 and iOS 12.3.1, Downgrades and Restores No Longer Possible

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Apple has stopped signing iOS 12.3 and iOS 12.3.1 which means that it is no longer possible to downgrade or restore to those firmware versions.

Currently, Apple's latest firmware is iOS 12.4. If you accidentally update or restore, you'll find yourself on iOS 12.4. Developers have been seeded with iOS 13 beta 5.

Those interested in jailbreaking are typically advised to stay on the lowest firmware possible. The unc0ver jailbreak works on all pre-A12 devices devices up to iOS 12.2 whereas the chimera jailbreak also works on A12 devices.

About Topteksystem

Topteksystem is an Apple repair center and Lenovo authorized service provider in Markham with professional and experienced team of Certified Technician. Performing Lenovo and Apple products repair services, under warranty, out of warranty, exchange and repair extensions programs. Topteksystem can offer you same day service for iPhone Screen and Battery replacement also we can repair all issues on Lenovo products, iPhone, iMac, MacBook Pro, MacBook air and other Apple products. Topteksystem can provide service to Markham, Toronto, Richmond Hill, Vaughan and North York regions. Also, Topteksystem expand its services and activities in IT fields included Supporting and Maintenance of IT products of organizations like Laptops and computers, Network and Network Security Services and Managed Network Services.

Our Services

Our guarantee after service

We guarantee our service, including replacement parts, for 90 days or the remaining term of your Apple warranty or AppleCare plan coverage, whichever is longer. We offer this whenever you get service from us or any other Apple Authorized Service Providers.

Contact Us

  • 3000 Hwy 7 East, Unit A9
    Markham, ON L3R 6E1

  • (905) 604-0700 | (905) 604-7475
  • info@topteksystem.com
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  • Same-Day Battery Replacement

  • Same-Day iPhone Display Replacement

  • Hard Drive & Memory Upgrade

  • Also We Do iPhone Screen Replacement, MacBook Pro Screen Replacement, MacBook Air Screen Replacement, iMac Screen Replacement, iPad Screen Replacement, iPod Screen Replacement,
    Within 1 Hour till 3 Business Days!!!

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