I just installed Debian 9.2 from scratch on my ASUS VivoPC. Just at the initial boot screen the following lines occur and can be reselected via dmesg:
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[ 8.156548] Bluetooth: hci0: rtl: examining hci_ver=06 hci_rev=000a lmp_ver=06 lmp_subver=8821
[ 8.156550] Bluetooth: hci0: rtl: loading rtl_bt/rtl8821a_config.bin
[ 8.303754] bluetooth hci0: firmware: failed to load rtl_bt/rtl8821a_config.bin (-2)
[ 8.303861] bluetooth hci0: Direct firmware load for rtl_bt/rtl8821a_config.bin failed with error -2
[ 8.303867] Bluetooth: hci0: Failed to load rtl_bt/rtl8821a_config.bin
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[ 8.303943] Bluetooth: hci0: rtl: loading rtl_bt/rtl8821a_fw.bin
[ 8.336653] bluetooth hci0: firmware: direct-loading firmware rtl_bt/rtl8821a_fw.bin
System:
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uname -a
Linux jb4 4.9.0-4-amd64 #1 SMP Debian 4.9.51-1 (2017-09-28) x86_64 GNU/Linux