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Hi ilHw_4713311 ,
1. After updating firmware, pairing information and BT mac was erased. How can I maintain it?
(Do I need external storage?)
A: Can you please clarify , did you reprogrammed the module or did OTA firmware upgrade ? Programming will re-write the entire flash, so nvram data will be lost . There is no way to retain the bonding info after reprogramming.
2. How can I use nvram for BT display name? I'm not sure if nvram is for custom usage.
A: You can use nvram APIs to read / write to nvram. Once you read back from the nvram, you can set device name by modifying .device_name of the wiced_bt_cfg_settings_t and setting the same in adv data using wiced_bt_ble_set_raw_advertisement_data
Thanks & Regards,