1. How to update the program: see "Chapter 9" of the document

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-Possible doubts or problems in module update -- the update is not successful
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1. What are the requirements for this TF card and USB stick?

==>TF card and U disk must be fat or FAT32 file system, and the maximum support is 32g.

2. Why do I copy the "updata. BFU" file to the tfcard for upgrading, then insert the prototype for upgrading, and start playing music directly

(1) , please note "updata. BFU". The file name must match one by one, no more letters, no less letters

(2) Updata is the file name, and BFU is the suffix of the file

(3) When you are on windows, be sure to open "display file suffix".

3. Why do I copy "updata. BFU" file to tfcard for upgrade. Then power on the sample, but not upgrade it?

1. For our upgrade, we must first power on the template and then insert the tfcard

2. The upgrade principle is as follows

(1) After the chip detects TF insertion, it will automatically initialize the TF card and file system

(2) , all of which are OK. Go to the file "updata. BFU". If you find it, go to upgrade

(3) . if any of the above links are wrong, the upgrade will be unsuccessful

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-Bt201 firmware upgrade introduction video
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1. Copy the file "updata. BFU" to the TF card and the U disk. There must be at least three MP3 audio files in the TF card or the U disk for reading the file system

2. Start the prototype, insert the USB flash disk, and the program will be updated automatically. Wait about 30 seconds to finish

3. If the upgrade is successful, if there is an indicator light, the indicator light is always on when the upgrade is finished and off when the upgrade is finished

4. After the introduction of this method, the machine with prompt tone is normal. If you insert the U disk or TF card, there will be prompt tone

5. Note: after the upgrade, you must delete the upgrade file in the card, otherwise the upgrade will be repeated

Do not unplug the tfcard or the USB flash disk during the upgrade process, otherwise the module will crash completely and can only be returned to the factory for maintenance

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---Description of check code
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1. The chip is programmable, so there will be many program versions

2. So what's the difference between procedures? So the function of the check code is here

3. The verification code is unique. The CRC verification tool we use survives

4. The check code is the information that must be remembered. Because there are many customers and many software versions, we are all based on the check code

5. When burning in batches, we will also guarantee that the burning program will not make mistakes according to the check code

Please remember that as long as the check code is in, the burning program will never make mistakes