1. Apple apologizes and updates iOS to restore iPhones disabled by error 53. https://techcrunch.com/2016/02/18/apple-apologizes-and-updates-ios-to-restore-iphones-disabled-by-error-53/ . Accessed 07 July 2016
2. BionX tuning. http://www.ebiketuning.com/comparison/bionx-tuning.html . Accessed 07 July 2016
3. Dell laptops reject third-party batteries and AC adapters/chargers. Hardware vendor lock-in? https://nctritech.wordpress.com/2010/01/26/dell-laptops-reject-third-party-batteries-and-ac-adapterschargers-hardware-vendor-lock-in/ . Accessed 07 July 2016
4. Epson firmware update = no to compatibles. http://www.wasteink.co.uk/epson-firmware-update-compatible-problem/ . Accessed 07 July 2016
5. ‘Error 53’ fury mounts as Apple software update threatens to kill your iPhone 6. https://www.theguardian.com/money/2016/feb/05/error-53-apple-iphone-software-update-handset-worthless-third-party-repair . Accessed 07 July 2016