Market sources have actually told Taiwanese information outlet Digitimes that manufacturing of the upcoming iPhone 5S will be restricted to 3-4 million systems in Q3 2013 due to a lack of the fingerprint scanners to be used in the phone. Particularly, the sources mention difficulties in interaction in between the fingerprint scanners and Apple’s upcoming iOS 7 mobile platform.

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Production of Apple’s next iPhone, typically referred to be the iPhone 5S and is arranged to be revealed on September 10, can reach just 3-4 million facilities in the third quarter of 2013 compared with 10 million units as initially planned due to a hold-up in production of fingerprint sensors needed for the iPhone 5S, according to market sources.

Mass production of the fingerprint sensors was originally scheduled to start in May at Taiwan Semiconductor Manufacturing Company (TSMC) and then to be packaged at Xintec, a TSMC subsidiary, the sources showed.

However, the manufacturing of the sensors has been postponed due to concerns related to integration between iOS 7 and fingerprint chips, as well as a low yield rate at product packaging firm Xintec, the sources revealed.

The report also states that engineers from Apple and TSMC will be arriving to packaging firm Xintec to assist enhance the yield rate for the fingerprint sensors, with volume production beginning at the end of August. Furthermore, the report declares production of the iPhone 5S is likely to then enhance to 28-30 million units in Q4 2013 due to the increased supply in fingerprint scanners.

KGI Securities expert Ming-Chi Kuo had previously reported that launch materials of the iPhone 5S would be tight due to production obstacles.

Earlier today, Kuo stated that the iPhone 5S would showcase a sapphire-covered convex house button that’d house a fingerprint sensor. A report yesterday also showed a brand-new home button as well with its conventional printed square mark being eliminated to perhaps make room for a fingerprint scanner.

Apple will apparently reveal the next-generation iPhone on September 10, but it’s still vague whether the occasion will focus singularly on the iPhone 5S or likewise consist of the announcement of the reported low-priced iPhone, possibly named the iPhone 5C.