OK you need a little bit more..... looks like it only works if you've a SSID configured.
First I've enabled link/mode persistance, set a static controller IP (free IP in the subnet) and then I've one bridge@AP untagged SSID - might be that some commands are missing or not needed but the AP doesn't reboot with the following setup..
cset modePersistence enable
cset linkPersistence enable
cset authip 1 192.168.0.250
capply
csave
#SSID
cset vapMode 0:1 bridge
cset vapVlanId 0:1 24876
cset uapsd 0:1 disable
cset vlanLegacy 0:1 disable
cset vapVidAc 0:1 22
cset vapSsid 0:1 "openone"
cset vapGroupKeyUpdate 0:1 0
cset vapWdsParentAP 0:1 ""
cset vapWdsBackParentAP 0:1 ""
cset vapWdsName 0:1 "AP3705i-1"
cset vapUcastFilterCos 0:1 add opennone no-rule
cset vapCos 0:1
cset vapMuInitPeriodBehaviour 0:1 defaultPolicy
cset vapDynamicEgressVlanList 0:1 45053 0
cset vapPolicyFlag 0:1 4
cset vapDefaultAction 0:1 4
cset vapDefaultContainVlan 0:1 45053
capply
csave
reboot