Hi everyone,
I messed up and bricked my EAP245v3 when I tried to return to stock firmware due to slow transfer speeds.
I accidentally tried to flash the v4 firmware 
I can successfully connect via TFTPD both with TFTPD64 and with Serva but both fail to complete the upload. It seems time related because when I upload at 1 Gbit/s I get to around 3 MB and when I set to 10 MBit/s I get to around 1.5 MB.
TFTPD64:
Connection received from 192.168.1.1 on port 2037 [01/08 22:11:35.562]
Read request for file <EAP245v3_up.bin>. Mode octet [01/08 22:11:35.568]
OACK: <timeout=5,> [01/08 22:11:35.568]
Using local port 51183 [01/08 22:11:35.568]
Connection received from 192.168.1.1 on port 1174 [01/08 22:11:41.583]
Read request for file <EAP245v3_up.bin>. Mode octet [01/08 22:11:41.583]
OACK: <timeout=5,> [01/08 22:11:41.583]
Using local port 51184 [01/08 22:11:41.583]
Serva:
[08/01 22:15:17.689] TFTP Inf: Read file <EAP245v3_up.bin>. Mode octet [08/01 22:15:23.707] TFTP Inf: Read file <EAP245v3_up.bin>. Mode octet [08/01 22:15:24.687] TFTP Err: timeout waiting for ack blk 16#4551 #4551 [08/01 22:15:27.689] TFTP Err: timeout waiting for ack blk 16#4551 #4551 [08/01 22:15:30.714] TFTP Err: timeout waiting for ack blk 16#5301 #5301 [08/01 22:15:32.701] TFTP Err: timeout waiting for ack blk 16#4551 #4551 [08/01 22:15:33.726] TFTP Err: timeout waiting for ack blk 16#5301 #5301 [08/01 22:15:37.714] TFTP Err: timeout waiting for ack blk 16#4551 #4551 [08/01 22:15:38.738] TFTP Err: timeout waiting for ack blk 16#5301 #5301 [08/01 22:15:42.717] TFTP Err: timeout waiting for ack blk 16#4551 #4551 [08/01 22:15:43.741] TFTP Err: timeout waiting for ack blk 16#5301 #5301 [08/01 22:15:47.728] TFTP Err: timeout waiting for ack blk 16#4551 #4551 [08/01 22:15:47.728] TFTP Err: TIMEOUT & abort waiting for Ack block #4551 [08/01 22:15:48.753] TFTP Err: timeout waiting for ack blk 16#5301 #5301 [08/01 22:15:52.677] TFTP Inf: Read file <EAP245v3_up.bin>. Mode octet [08/01 22:15:53.768] TFTP Err: timeout waiting for ack blk 16#5301 #5301 [08/01 22:15:53.768] TFTP Err: TIMEOUT & abort waiting for Ack block #5301 [08/01 22:15:58.687] TFTP Inf: Read file <EAP245v3_up.bin>. Mode octet [08/01 22:15:59.675] TFTP Err: timeout waiting for ack blk 16#4720 #4720 [08/01 22:16:02.684] TFTP Err: timeout waiting for ack blk 16#4720 #4720 [08/01 22:16:05.699] TFTP Err: timeout waiting for ack blk 16#6010 #6010 [08/01 22:16:07.688] TFTP Err: timeout waiting for ack blk 16#4720 #4720 [08/01 22:16:08.701] TFTP Err: timeout waiting for ack blk 16#6010 #6010 [08/01 22:16:12.700] TFTP Err: timeout waiting for ack blk 16#4720 #4720 [08/01 22:16:13.713] TFTP Err: timeout waiting for ack blk 16#6010 #6010 [08/01 22:16:17.708] TFTP Err: timeout waiting for ack blk 16#4720 #4720 [08/01 22:16:18.717] TFTP Err: timeout waiting for ack blk 16#6010 #6010 [08/01 22:16:22.716] TFTP Err: timeout waiting for ack blk 16#4720 #4720 [08/01 22:16:22.716] TFTP Err: TIMEOUT & abort waiting for Ack block #4720 [08/01 22:16:23.724] TFTP Err: timeout waiting for ack blk 16#6010 #6010 [08/01 22:16:28.738] TFTP Err: timeout waiting for ack blk 16#6010 #6010 [08/01 22:16:28.738] TFTP Err: TIMEOUT & abort waiting for Ack block #6010
I also tried flashing OpenWRT (openwrt-25.12.1-ath79-generic-tplink_eap245-v3-squashfs-factory.bin) but that also failed in a very similar fashion:
Connection received from 192.168.1.1 on port 2215 [01/08 22:19:31.046] Read request for file <EAP245v3_up.bin>. Mode octet [01/08 22:19:31.046] OACK: <timeout=5,> [01/08 22:19:31.063] Using local port 56194 [01/08 22:19:31.063] Connection received from 192.168.1.1 on port 1327 [01/08 22:19:37.065] Read request for file <EAP245v3_up.bin>. Mode octet [01/08 22:19:37.065] OACK: <timeout=5,> [01/08 22:19:37.065] Using local port 56195 [01/08 22:19:37.065] TIMEOUT waiting for Ack block #6556 [01/08 22:20:01.063] TIMEOUT waiting for Ack block #6060 [01/08 22:20:07.099]
10MBit/s:
when I set to 10MBit/s full duplex as fixed ethernet speed, it fails sooner or rather, uploads even less:
Connection received from 192.168.1.1 on port 3540 [01/08 22:39:02.524]
Read request for file <EAP245v3_up.bin>. Mode octet [01/08 22:39:02.526]
OACK: <timeout=5,> [01/08 22:39:02.528]
Using local port 56995 [01/08 22:39:02.528]
Connection received from 192.168.1.1 on port 1186 [01/08 22:39:08.544]
Read request for file <EAP245v3_up.bin>. Mode octet [01/08 22:39:08.544]
OACK: <timeout=5,> [01/08 22:39:08.544]
Using local port 49375 [01/08 22:39:08.544]
TIMEOUT waiting for Ack block #2610 [01/08 22:39:32.563]
TIMEOUT waiting for Ack block #2506 [01/08 22:39:38.583]
Can anybody think of how I can fix this? Can the flash be "full" due to the upload of the v4 firmware? Or something else like that?
I tried different timeouts etc.
Both apps seem to upload twice, i.e. they start one upload and then start another. But no third. And both fail.
I have tried releasing Reset immediately and holding it the whole time.
Thank you everyone for your help 
Alex