Firmware upgrade provision "File extension check unacceptable"

[Jackson Sparkle]

I have a Vigor 2760 in many version for VoIP and Wifi, so I use a provision
script to automatically update the routers firmware by their ProductClass.
I named the files like this:
v2760Vn_std_3894.all
v2760Vn_vect4_3894.all
v2760n_std_3894.all

If I send the firmware upgrade through the "Push file" in the gui, it
works, but if the preset is triggered by the provision, I get the
fault "File extension check unacceptable".
What am I doing wrong?

My provision looks like this:
var HARDWARE = declare("InternetGatewayDevice.DeviceInfo.HardwareVersion",
{value: Date.now()}).value[0];
var PRODUCT_CLASS =
declare("InternetGatewayDevice.DeviceInfo.ProductClass", {value:
Date.now()});
PRODUCT_CLASS = PRODUCT_CLASS.value[0].replace("Vigor", "v");
var REP_VERSION =
declare("InternetGatewayDevice.DeviceInfo.SoftwareVersion", {value:
Date.now()}).value[0];
var REQ_VERSION, REQ_FILE;

if (HARDWARE >= "121" && HARDWARE <= "124") { //Vigor2710
REQ_VERSION = "3.7.3_2111112";
REQ_FILE = PRODUCT_CLASS + "_b_373.all";
} else if (HARDWARE >= "136" && HARDWARE <= "138" &&
!REP_VERSION.includes("VT") && declare("Tags.vt", {value:
Date.now()}).value === undefined) { //Vigor2760
REQ_VERSION = "3.8.9.4_STD";
REQ_FILE = PRODUCT_CLASS + "_std_3894.all";
} else if (HARDWARE >= "136" && HARDWARE <= "138" &&
(REP_VERSION.includes("VT") || declare("Tags.vt", {value:
Date.now()}).value !== undefined)) { //Vigor2760 VT4
REQ_VERSION = "3.8.9.4_VT4";
REQ_FILE = PRODUCT_CLASS + "_vect4_3894.all";
}

if (REP_VERSION !== REQ_VERSION) {
declare("Tags.upgrading", null, {value: true});
declare("Tags.vt", null, {value: false});

declare("Downloads.[FileType:1 Firmware Upgrade Image]", {path: 1}, {path:
1});
declare("Downloads.[FileType:1 Firmware Upgrade Image].FileName", {value:
1}, {value: REQ_FILE});
declare("Downloads.[FileType:1 Firmware Upgrade Image].Download", {value:
1}, {value: Date.now()});
}
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