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For months, the ONO team has been working on compatibility issues between the printer and the hundreds of phones currently available on the market delaying shipments. From the start of the project, the decision was made to use the audio output to communicate with the printer to maximize the compatibility with phones, especially older ones, since a hardware connection through the audio jack is more reliable than wireless communication. What the team was not prepared for was the variation not only between phones, but between software versions on the same phone. Fixing problems on one system resulted in a degradation in another, causing a crippling problem.

On Tuesday, April 4, 2018, the ONO Team finally received the long-awaited UL certification for the latest redesign of the electronics board. Several months ago, an issue was found with the compatibility of the printer with some phones on the market. This prompted the team to go back to the drawing board and redesign the electronics to solve this problem, not only for the phones on the market today, but guard against the newer phones also being incompatible.