I recommend that you purchase an unlimited chip from a specialized Internet company. Here guide for philips zoom . Ordering from this company is safe. The chips are original and suitable for all models of zoom whitening lamps. The warranty period for the chip is 10 years. It seems to me that this is an excellent indicator of the quality of the product. Also on the company's website there is a video of installing the chip. You can see how the replacement is carried out. Make it very easy and fast.
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