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Switch#copy tftp: flash: 
 
Address of remote host []? 10.90.90.1
Source filename []? DGS-3620/DGS3620_Run_2_69_B001.had
Destination filename []? DGS3620_Run_2_69_B001.had
 Accessing tftp://10.90.90.1/DGS-3620/DGS3620_Run_2_69_B001.had...
 Transmission start... 
 Transmission finished, file length 8257892 bytes.
 Please wait, programming flash.............. Done. 

Switch#dir
 
Directory of /c:
1   -rw       8257892 Nov 16 2018 17:16:38  DGS3620_Run_2_69_B001.had
2   -rw         37011 Nov 16 2018 16:19:09  config.cfg
3   -rw       6111876 Nov 16 2018 16:44:21  runtime.had
4   -rw       6114092 Nov 16 2018 17:11:14  DGS3620_Run_1_58_R004.had
5   d--             0 Nov 16 2018 17:13:24  system

Switch#copy running-config startup-config 
 
Destination filename startup-config? [y/n]:  y
 
Saving all configurations to NV-RAM.......... Done. 

Switch(config)#boot image DGS3620_Run_2_69_B001.had

Switch#show boot
 
Unit 1
 Boot image: /c:/DGS3620_Run_2_69_B001.had
 Boot config: /c:/config.cfg

reboot