U1 or Class 4 cards. They will cause “SD card error” within hours.
It means the device’s firmware has been optimized for a specific set of SD card specifications. In practice, the “MP313D-W SD card” requirement translates to: mp313d-w sd card
First, let’s clear up the confusion. You will not find this printed on a microSD card’s label. U1 or Class 4 cards
Counterfeit cards (showing 128GB but actually 8GB) are common on Amazon and eBay. Use (Windows) or F3 (Mac/Linux) to write and verify the full capacity. If it fails, the card is fake. the card is fake.