I scrounged up someone’s UR-02 remote.conf file UR02
Ugoos UR-01 has a factory code of 0xff000001 either 0x14, or 0xff.
UR-02 has factory code (assuming that conf file was posted unmodified from Ugoos) of 0xe6190001 and 0x74 for power.
Not sure if this is for the AM6B+ (which is all the rage right now!), but my understanding is that since it has a locked bootloader, that makes it so that the box is hard coded to that specific power button on the UR-01, when it’s either powered off, or in standby. So as far as I know that needs to stay as the power-on/resume button.
What you should be able to do is effectively swap the buttons. Gray button becomes power-on/standby-resume programmed from the UR-01 remote (the red one) , The UR-02’s red power button should trigger the device to go into standby. Keep in mind you will need two remote.conf files: one for UR-01 and another for UR-02.
Original line for the red power button (this should trigger standby mode in its current setting):
0x74 116 # power ← keep this as is
In the UR-01 remote.conf file:
0x14 143 #wakeup
This is the remote.conf file I use for like UR-01:
work_mode = 0
repeat_enable = 1
repeat_delay = 130
repeat_peroid = 120
release_delay = 20
debug_enable = 1
custom_begin
factory_code = 0xff000001
key_begin
0x14 143 #wakeup
0xff 116 #power
0x13 139 #menu
0x03 103 #up
0x02 108 #down
0x0e 105 #left
0x1a 106 #right
0x07 28 #ok
0x58 114 #volume-
0x0b 115 #volume+
0x01 158 #back
0x48 102 #home
0x5c 164 #play/pause
key_end
custom_end
And for anyone that cares, the Dune HD Premium IR Remote conf file, I use both remotes programmed into a Harmony 900 remote. Because I like remote buttons, they don’t scare me if there’s too many. 
# *********************************************************************************************************
#
# this file is configuration for each factory remote device
#
# work_mode 0 :software mode 1 :hardware mode
# repeat_enable 0 :disable repeat 1 :enable repeat
#
# factory_code each device has it's unique factory code.
# pattern:custom_code(16bit)+index_code(16bit)
# examble: 0xff000001 = 0xff00(custom cod) 0001 (index)
#
# release_delay unit:ms.release will report from kernel to user layer after this period of time
# from press or repeat triggered.
#
# debug_enable 0 :debug disable 1 :debug disable
#
# SW MODE:
#
# bit_count how many bits in each frame
# tw_leader_act time window for leader active
# tw_bit0 time window for bit0 time.
# tw_bit1 time window for bit1 time
# tw_repeat_leader time window for repeat leader
#
# REG
#
# reg_base_gen set value for PREG_IR_DEC_BASE_GEN
# reg_control set value for PREG_IR_DEC_CONTROL
# reg_leader_act set value for PREG_IR_DEC_LEADER_ACTIVE
# reg_leader_idle set value for PREG_IR_DEC_LEADER_IDLE
# reg_repeat_leader set value for PREG_IR_DEC_REPEAT_IDLE
# reg_bit0_time set value for PREG_IR_DEC_BIT0_TIME
#
# *********************************************************************************************************
#
# amlogic NEC remote * Dune HD Premium IR Remote
#
factory_code = 0xbf000001
factory_infcode = 1 # set as second remote
work_mode = 0
repeat_enable = 1
repeat_delay = 130
repeat_peroid = 120
release_delay = 20
debug_enable = 1
#OLD SETTINGS
# work_mode = 0
# repeat_enable = 1
# repeat_delay = 40
# repeat_peroid = 50
# release_delay = 100
# debug_enable = 1
#
left_key_scancode = 0x17
right_key_scancode = 0x18
up_key_scancode = 0x15
down_key_scancode = 0x16
ok_key_scancode = 0x14
fn_key_scancode = 0x81
#
key_begin
0x15 103 #KEY_UP
0x16 108 #KEY_DOWN
0x17 105 #KEY_LEFT
0x18 106 #KEY_RIGHT
0x14 28 #KEY_ENTER
0x04 158 #AC_Back
0x44 226 #KEY_MEDIA
0x45 65 #F7 MODE
0x06 217 #KEY_SEARCH
0x02 15 #KEY_TAB
0x4f 125 #KEY_LEFTMETA CURSOR
0x07 46 #KEY_C - Context Menu
0x43 116 #KEY_POWER
0x42 58 #KEY_CAPSLOCK
0x4e 64 #F6 SETUP
0x63 377 #KEY_TV TV
0x47 393 #KEY_VIDEO MOVIES
0x58 392 #KEY_AUDIO MUSIC
0x54 63 #F5 SUBTITLE
0x51 130 #KEY_PROPS
0x50 23 #KEY_I
0x40 59 #KEY_F21 KEY_RED
0x1f 60 #KEY_F22 KEY_GREEN
0x00 61 #KEY_F23 KEY_YELLOW
0x41 62 #KEY_F24 KEY_BLUE
0x52 115 #KEY_VOLUMEUP
0x53 114 #KEY_VOLUMEDOWN
0x80 104 #TV_UP KEY_PAGEUP
0x83 109 #TV_DOWN KEY_PAGEDOWN
0x82 142 #TV_POWER KEY_SLEEP
0x4b 104 #KEY_PAGEUP
0x4c 109 #KEY_PAGEDOWN
0x46 113 #KEY_MUTE
0x61 102 #KEY_HOME
0x1c 168 #KEY_REWIND
0x1b 208 #KEY_FASTFORWARD
0x49 165 #KEY_PREVIOUSSONG
0x1d 163 #KEY_NEXTSONG
0x48 207 #KEY_PLAY
0x1e 164 #KEY_PLAYPAUSE
0x60 167 #KEY_RECORD
0x19 128 #KEY_STOP
0x0b 2 #KEY_1
0x0c 3 #KEY_2
0x0d 4 #KEY_3
0x0e 5 #KEY_4
0x0f 6 #KEY_5
0x01 7 #KEY_6
0x11 8 #KEY_7
0x12 9 #KEY_8
0x13 10 #KEY_9
0x0a 11 #KEY_0
0x05 52 #KEY_DOT
# 0x02 120 #KEY_SCALE
# 0x50 138 #KEY_HELP
# 0x07 139 #KEY_MENU
# 0x50 23 #KEY_I
# 0x42 353 #KEY_SELECT
# 0x42 58 #KEY_CAPSLOCK
# 0x05 78 #KEY_KPPLUS
# 0x04 1 #KEY_ESC
# 0x4c 403 #KEY_CHANNELDOWN
# 0x4b 402 #KEY_CHANNELUP
# 0x51 619 #KEY_MEDIA_TOP_MENU
# 0x50 358 #KEY_INFO
# 0x54 370 #KEY_SUBTITLE
# 0x07 438 #KEY_CONTEXT_MENU
# 0x02 372 #KEY_FULL_SCREEN
# 0x44 392 #KEY_AUDIO
# 0x45 373 #KEY_MODE
key_end